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Study Resources (Statistics)

    31.The weight of a chemical compound used in an experiment that is obtained using a well-adjusted scale represents a(n) _____________ level of measurement.    A.Nominative   B.Ordinal   C.Interval   D.Ratio Nominative and ordinal are qualitative variables; weight creates logical ratios: 60 lbs is twice as heavy as 30 lbs.       32.An identification of police officers by rank would represent a(n).
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71.In a one-way analysis of variance with three treatments, each with five measurements, in which a completely randomized design is used, compute the F statistic where the sum of squares treatment is 17.0493 and the sum of squares error is 8.028.            72.Consider the following one-way ANOVA table.  What is the value of.
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88.A fast-food company uses two management-training methods. Method 1 is a traditional method of training, and Method 2 is a new and innovative method. The company has just hired 31 new management trainees. 15 of the trainees are randomly selected and assigned to Method 1, and the remaining 16 trainees.
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  True / False Questions  1.An independent samples experiment is an experiment in which there is no relationship between the measurements in the different samples.    2.When testing the difference between two proportions selected from populations with large independent samples, the z test statistic is used.    3.In forming a confidence interval for μ1 - μ2,.
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    41.Any characteristic of an element is called a ____________.    A.Set   B.Process   C.Variable   D.Census A process is a sequence of operations; a census looks at the entire population; set is related to population.       42.The process of assigning a value of a variable to each element in a data set is called ___________.    A.Sampling   B.Measurement   C.Experimental analysis   D.Observational analysis By definition, sampling is.
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  41.When testing the difference for the population of paired differences in which two different observations are taken on the same units, the correct test statistic to use is ____.    A.z B.t C.F D.t2 42.In order to test the effectiveness of a drug called XZR designed to reduce cholesterol levels, the cholesterol levels of 9 heart.
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  True / False Questions  1.A population is a set of existing units.          2.If we examine some of the population measurements, we are conducting a census of the population.    A census is defined as examining all of the population measurements.       3.A random sample is selected so that every element in the population has the same.
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True / False Questions  1.If factors being studied cannot be controlled, the data are said to be observational.  True    False   2.A one-way analysis of variance is a method that allows us to estimate and compare the effects of several treatments on a response variable.  True    False   3.In a completely randomized (one-way) ANOVA, with other things being equal,.
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86.Let p1 represent the population proportion of U.S. senatorial and congressional (House of Representatives) Democrats who are in favor of a new modest tax on junk food. Let p2 represent the population proportion of U.S. senatorial and congressional Republicans who are in favor of a new modest tax on junk.
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82.Determine the 95 percent confidence interval for the difference between two population means, where sample 1 has data: 16, 14, 19, 18, 19, 20, 15, 18, 17, 18; and sample 2 has data: 13, 19, 14, 17, 21, 14, 15, 10, 13, 15. (Assume equal population variances.)    83.Calculate the t statistic.
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90.A fast food company uses two management-training methods. Method 1 is a traditional method of training, and Method 2 is a new and innovative method. The company has just hired 31 new management trainees. 15 of the trainees are randomly selected and assigned to the first method, and the remaining.
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    11.The number of sick days per month taken by employees for the last 10 years at Apex Co. is an example of time series data.          12.A quantitative variable can also be referred to as a categorical variable.    Qualitative variables are also known as categorical variables.       13.In a data set of information on college.
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123.Suppose that a realtor is interested in comparing the price of midrange homes in two cities in a midwestern state. She conducts a small survey in the two cities, looking at the price of midrange homes. Assume equal population variances.  Set up the alternative hypothesis to test the claim that there.
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    51.The change in the daily price of a stock is what type of variable?    A.Qualitative   B.Ordinal   C.Random   D.Quantitative Qualitative and ordinal have similar definitions; random variables are all characteristics of a population element.       52.Data collected for a particular study are referred to as a data ____________.    A.Variable   B.Measurement   C.Set   D.Element By definition, a variable is a characteristic of an element; a.
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131.Two different firms design their own tests for business graduates, and an employer administers both versions to a random selection of prospective employees. Results are below. At α = .02, test the claim that both versions produce the same score.Mean difference = -4.25Standard error of the difference = 1.411   132.When testing.
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  31.A financial analyst working for a financial consulting company wishes to find evidence that the average price-to-earnings ratio in the consumer industry is higher than the average price-to-earnings ratio in the banking industry. The alternative hypothesis is:    A.μconsumer = μbanking B.μconsumer ≤ μbanking C.μconsumer> μbanking D.μconsumer< μbanking E.μconsumer ≠ μbanking 32.In testing the difference between two.
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84.Find a 99 percent confidence interval for the difference between means, given that  (Assume unequal variances.)    85.Let p1 represent the population proportion of U.S. senatorial and congressional (House of Representatives) Democrats who are in favor of a new modest tax on junk food. Let p2 represent the population proportion of U.S. senatorial.
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103.A marketing research company surveyed grocery shoppers on the East Coast and West Coast to find the percentage of the customers who prefer chicken to other meat. The data are given below.  Is the proportion of customers who prefer chicken higher on the West Coast? Test at104.A marketing research company surveyed.
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66.Looking at four different diets, a researcher randomly assigned 20 equally overweight women into each of the four diets. What are the degrees of freedom for the error?            67.Looking at four different diets, a researcher randomly assigned 20 equally overweight women into each of the four diets. What are the degrees.
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92.A fast food company uses two management-training methods. Method 1 is a traditional method of training, and Method 2 is a new and innovative method. The company has just hired 31 new management trainees. 15 of the trainees are randomly selected and assigned to the first method, and the remaining.
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128.A test of driving ability is given to a random sample of 10 student drivers before and after they complete a formal driver education course. Results follow.  Calculate the mean difference between the before-class scores and the after-class scores.    129.A test of driving ability is given to a random sample of 10.
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  11.In testing the difference between the means of two independent populations, if neither population is normally distributed, then the sampling distribution of the difference in means will be approximately normal, provided that the sum of the sample sizes obtained from the two populations is at least 30.    12.When comparing two population.
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70.Find a 90 percent confidence interval for the difference between the proportions of failures in factory 1 and factory 2, where71.Using a 90 percent confidence interval of [-.0076, .0276] for the difference between the proportions of failures in factory 1 and factory 2, where  can we reject the null hypothesis at.
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  51.In general, the shape of the F distribution is _________.    A.skewed right B.skewed left C.normal D.binomial 52.Parameters of the F distribution include:    A.n1 B.Degrees of freedom C.n2 D.n1 and n2 E.None of these 53.In testing the equality of population variance, what assumption(s) should be considered?    A.Independent samples B.Equal sample sizes C.Normal distribution of the populations D.Independent samples and Equal sample sizes E.Independent samples and Normal distribution.
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101.Zdravko Popovich, the mid-distance running coach for the Olympic team of an eastern European country, claims that his six-month training program significantly reduces the average time to complete a 1500-meter run. Five mid-distance runners were randomly selected. Their times (in minutes) for the 1500-meter run were recorded before and after.
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79.We are testing the hypothesis that the proportion of winter-quarter profit growth is more than 2 percent greater for consumer industry companies (CON) than for banking companies (BKG). At α = .10, given that  calculate the estimated standard deviation for the model.    80.Sample 1 has data: 16, 14, 19, 18, 19, 20,.
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108.Two hospital emergency rooms use different procedures for triage of their patients. We want to test the claim that the mean waiting time of patients is the same for both hospitals. The 40 randomly selected subjects from one hospital produce a mean of 18.3 minutes. The 50 randomly selected patients.
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99.Find a 95 percent confidence interval for the difference between the proportions of people who prefer cola versus root beer (RB), where   100.Zdravko Popovich, the mid-distance running coach for the Olympic team of an eastern European country, claims that his six-month training program significantly reduces the average time to complete a.
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105.A marketing research company surveyed grocery shoppers on the East Coast and West Coast to find the percentage of the customers who prefer chicken to other meat. The data are given below.  Determine the 95 percent confidence interval for the difference between the proportion of customers on the West Coast who.
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    21.Primary data are data collected by an individual.          22.Secondary data are data taken from an existing source.          Multiple Choice Questions  23.Data that are collected by an individual through personally planned experimentation or observation are _____________.    A.Secondary data   B.Quantitative data   C.Primary data   D.Variables By definition, primary data are collected by an individual while secondary data are from an existing.
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