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Study Resources (Statistics)

  27.The authorship of ancient writings is frequently in dispute. One method for judging authorship of writings from the Classical Greek period is to analyze the proportion of sentences containing the word, ??'?. (??'? is an article, something like "a," "an," and "the" in English.) If a particular collection of works.
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  26.You will be asked to sketch curves representing the distributions of a set of data, as well as the sampling distributions of the mean under different conditions. You need not get these graphs perfectly correct, but should clearly indicate different aspects of the curves, such as location, variability, and shape.   The.
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  38.Reading comprehension is arguably the single most important skill a student possesses. To assess the current levels of reading comprehension in 3rd grade, 25 students were randomly selected from school district class lists and given a reading comprehension test. The distribution of their scores was approximately normal with a mean.
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  SHORT ANSWER   20.Consider sampling from a skewed population. As the sample size, n, increases, some characteristics of the sampling distribution of change. Does an increasing sample size cause changes in the characteristics of the sampling distribution shown below? If so, specifically how does the sampling distribution change?   a) The mean of the.
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  33.Some people believe that criminals who plead guilty will, on average, get lighter sentences. The following table summarizes data from a random sample of San Francisco defendants in burglary cases.   Pleas by Sentencing Fate       Not Guilty   Guilty Plea Plea Sent to Prison 392 58 Not sent to Prison 564 14   If the null hypothesis is that the plea and the sentencing.
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  47.An important part of any dispensing process is statistical quality control. At the Billy Goat Gruff Inn, machines are set to dispense 600 ml of soda into every customer's glass. Over time, however, the machine can get "out of control" and dispense too much soda or too little. At a.
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  17.When testing hypotheses involving treatment effects in an experiment, the conclusions of any inference test should be worded in terms of what quantities?   The conclusions to any inference test should be worded in terms of treatment effects (treatment means or treatment proportions).     18.As part of the iguana risk assessment experiment described in.
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TRUE/FALSE   1.When testing hypotheses concerning differences in treatment effects from an experiment, the test statistic used for comparing two treatments is the same as the test statistic used for comparing differences between two population means from a sample study.     2.When estimating the difference between two treatment effects, the format of the confidence.
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  27.In 1992 Hurricane Andrew struck Florida causing widespread devastation. The eye of Hurricane Andrew passed directly over a site where scientists were studying the ecology of white-tailed deer. The deer had been radio-collared prior to Andrew's appearance, and the hurricane provided an opportunity to study the effects of an awesome.
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  MULTIPLE CHOICE   8.Samples from two independent, normally-distributed populations produced the following results.     Population 1 Population  2 Sample size 6 8 Sample mean 48.5 39.9 Population standard deviation 11.2 13.8   Calculate the test statistic for the difference between population means, .   a. 1.889 b. 8.6 c. 1.128 d. 1.286       9.The data below give the weights in ounces of randomly-selected bars of bath soap produced by two different molding machines.     Weights (ounces) Machine 1 11.412.412.111.811.811.712.312.011.8 Machine 2 13.012.412.412.112.312.112.512.012.1     The question.
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  41.Psychologists have noted that people tend make classifications based on their "typicality." For example, a dog is more readily classified as a mammal than is a whale, because dogs are "more typical" of mammals than are whales. Previous large-scale studies have established the following for songbirds such as robins: when.
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  25.The authorship of ancient writings is frequently in dispute. One method for judging authorship of writings from the Classical Greek period is to analyze the proportion of sentences containing the word, ??'?. (??'? is an article, something like "a," "an," and "the" in English.) If a particular collection of works.
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  43.The department of natural resources defines a fish to be unsafe to eat if the polychlorinated biphenol (PCB) concentration exceeds 5 parts per billion (ppb). A random sample of 10 fish taken from a local lake resulted in the data listed below:     2.6,   6.6,   4.8,   5.4,   5.1,   4.5,   6.9,   4.9,   3.7,  .
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  SHORT ANSWER   18.When testing hypotheses about and constructing confidence intervals for ?1 ? ?2, we utilize the statistic, . What are the mean and variance of the sampling distribution of ?       19.Suppose a researcher is collecting data to compare the average amount of soda consumed daily by men and women.  The researcher.
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TRUE/FALSE   1.A chi-squared goodness-of-fit can be used to test hypotheses about the proportion of the population falling into each of the possible categories.     2.In order to decide whether the observed data is compatible with the null hypothesis, the observed cell counts are compared to the cell counts that would be expected when.
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  32.Black bears (Ursus americanus), and their use of National Parks can be a problem for humans. Bear travels are governed by the need for food, as well as a high degree of natural curiosity. Some humans inadvertently or purposefully feed the bears, leading them to harass the human population. When.
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  29.Some people believe that criminals who plead guilty will, on average, get lighter sentences. The following table summarizes data from a random sample of San Francisco defendants in burglary cases.   Pleas by Sentencing Fate       Not Guilty   Guilty Plea Plea Sent to Prison 392 58 Not sent to Prison 564 14   If the null hypothesis is that the plea and the sentencing.
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  MULTIPLE CHOICE   9.What is the approximate P-value for and df = 5?   a. 0.095 b. 0.020 c. 0.057 d. 0.088 e. 0.040       10.Each person in a random sample of 105 ice cream eaters was asked to “vote for” a preferred flavor from the flavors listed in the table below.     What is the value of the test statistic for the hypothesis that, given.
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  27.One of the most striking human accomplishments is the achievement of intelligible speech by age five. Deficits in speech acquisition often occur when a child has hearing difficulty or does is slow to develop the motor functions associated with speech. Other deficits in speech acquisition are of unknown origin. It.
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  SHORT ANSWER   11.Suppose that you wish to compare two treatments for preventing baldness in men. (The measure of baldness you will use is the mean number of healthy hair follicles per square cm.) In some circumstances, you may be able to randomly assign the treatments to the men, and in some.
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  44.A boat manufacturer claims that a particular boat and motor combination will burn less than 4.0 gallons of fuel per hour. Fuel consumption for a random sample of 10 similar boats resulted in the data below:     4.06,   4.29,   4.26,   4.64,   4.23,   3.93,   3.64,   4.13,   3.93,   3.86   Is there sufficient evidence to conclude.
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  21.When testing hypotheses about and constructing confidence intervals for ?1 ? ?2, we utilize the statistic, . What are the mean and standard deviation of the sampling distribution of ?       22.Body fat and lean body mass can be estimated in living animals by measuring the total body electrical conductivity (TOBEC). This.
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  23.The arithmetic calculations and statistical procedures for (a) the test of homogeneity and (b) the test of independence are the same.   a) Explain in a few sentences what distinguishes these two hypothesis tests.     b) To illustrate your answer in part (a), make up an example of a research question that would require a test.
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  14.A common memory task is the classification of objects into categories. For example, a table is a piece of furniture; a dog is an animal, etc. This classification capability was used in a recent study of divided attention. Elderly adults were randomly selected from those answering a newspaper advertisement, and.
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  13.A common memory task is the classification of objects into categories. For example, a table is a piece of furniture; a dog is an animal, etc. This classification capability was used in a recent study of divided attention. College Psychology students were randomly selected and randomly assigned to one of.
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  23.You will be asked to sketch curves representing the distributions of a set of data, as well as the sampling distributions of the mean under different conditions. You need not get these graphs perfectly correct, but should clearly indicate different aspects of the curves, such as location, variability, and shape.   A.
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  MULTIPLE CHOICE   11.For a random sample from a skewed population, for which of the following sample sizes would the sampling distribution of   be closest to normal in shape?   a. n = 11 b. n = 18 c. n = 19 d. n = 22 e. n = 40       12.What is the standard deviation of  for random samples of size 80.
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  SHORT ANSWER   17.Suppose that we are studying the purchasing behavior of individuals buying dog food. We hypothesize that half the dog food purchases will be the big name brand, "Lassie Chow" and that the remaining purchases will be divided equally between two local brands, "Bow Wow Chow" and "Woof Woof Wafers."   a) Define.
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  26.Scandinavian researchers investigated the effects of hunting male bears on succeeding generations. (The effects of hunting females on successive generations are well documented.) They hypothesized that when a male is killed a new male will move in, and maximize his reproductive success by killing existing cubs (so that the females.
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  28.Black bears (Ursus americanus), and their use of National Parks can be a problem for humans. Bear travels are governed by the need for food, as well as a high degree of natural curiosity. Some humans inadvertently or purposefully feed the bears, leading them to harass the human population. When.
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  45.Suppose that a study has been published linking arsenic, which is commonly found in tap water, to increased cancer rates. The study also stated that arsenic levels below 10 ppm could be considered harmless. Suppose that residents of Hacienda Heights, CA, are worried about the arsenic level in the local.
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  49.A company provides portable walkie-talkies to construction crews. Their batteries last, on average, 55 hours of continuous use. The purchasing manager receives a brochure advertising a new brand of batteries with a lower price, but suspects that the lifetime of the batteries may be shorter than the brand currently in.
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  26.One of the most striking human accomplishments is the achievement of intelligible speech by age five. Deficits in speech acquisition often occur when a child has hearing difficulty or is slow to develop the motor functions associated with speech. Other deficits in speech acquisition are of unknown origin. Males generally.
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TRUE/FALSE   1.The distribution of will always have the same shape as the distribution of the population being sampled.     2.For n sufficiently large, the distribution of is approximately a standard normal distribution.     3.As n grows larger, the mean of the sampling distribution of gets closer to ?.     4.The standard deviation of the.
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  29.Under what conditions is it reasonable to use the z confidence interval to estimate a population mean?       30.Under what conditions is it reasonable to use the t confidence interval to estimate a population mean?       31.A new species of sea crab has been discovered, and an experiment conducted to determine whether or not.
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  24.Viruses are infectious agents that often cause diseases in plants. Different viruses have different potency levels, and this fact can be used to detect whether a new virus is infecting plants in the field. In a potency comparison experiment, two viruses were placed on a tobacco leaf of 10 randomly.
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