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Study Resources (Statistics)

  11. The rejection region for a hypothesis test becomes smaller if the level of significance is changed from 0.01 to 0.05. 12. Whenever hypotheses are established such that the alternative hypothesis is "μ>8", where μ is the population mean, the hypothesis test would  be a two-tailed test. 13.Whenever hypotheses are established such.
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    Multiple Choice 20.Catherine Chao, Director of Marketing Research, is evaluating consumer acceptance of a new toothpaste package.  Her staff reports that 17% of a random sample of 200 households prefers the new package to all other package designs.  If Catherine concludes that 17% of all households prefer the new package, she.
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  11. For a binomial distribution in which the probability of success is p = 0.5, the variance is twice the mean. 12. The Poisson distribution is a continuous distribution which is very useful in solving waiting time problems 13. Both the Poisson and the binomial distributions are discrete distributions and both have.
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  82.Discrete Components, Inc. manufactures a line of electrical resistors.  Presently, the carbon composition line is producing 100 ohm resistors.  The population variance of these resistors "must not exceed 4" to conform to industry standards.  Periodically, the quality control inspectors check for conformity by randomly select 10 resistors from the line,.
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  65.A researcher is interested in estimating the difference in two population proportions. A sample of 400 from each population results in sample proportions of .61 and .64. The point estimate of the difference in the population proportions is _______. a) -0.030 b) 0.625 c) 0.000 d) 0.400 e) 0.500 66.A researcher is interested in estimating the.
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    40.The table t value associated with the upper 5% of the t distribution and 14 degrees of freedom is _______. a) 2.977 b) 2.624 c) 2.145 d) 1.761 e) 1.345 41.The table t value associated with the upper 10% of the t distribution and 23 degrees of freedom is _______. a) 1.319 b) 1.714 c) 2.069 d) 1.321 e) 2.332 42.A researcher.
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  67.Albert Abbasi, VP of Operations at Ingleside International Bank, is evaluating the service level provided to walk-in customers.  Accordingly, he plans a sample of waiting times for walk-in customers.  If the population of waiting times has a mean of 15 minutes and a standard deviation of 4 minutes, the probability.
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  21. If the population is normally distributed, the sample means of size n=5 are normally 22. The sampling distribution of the sample means is close to the normal distribution only if the distribution of the population is close to normal. 23. The sampling distribution of the sample means is less variable than.
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    30.Brian Vanecek, VP of Operations at Portland Trust Bank, is evaluating the service level provided to walk-in customers.  Accordingly, his staff recorded the waiting times for 64 randomly selected walk-in customers and determined that their mean waiting time was 15 minutes.  Assume that the population standard deviation is 4 minutes. .
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True/False 1. Hypotheses are tentative explanations of a principle operating in nature. 2. The first step in testing a hypothesis is to establish a true null hypothesis and a false alternative hypothesis. 3. In testing hypotheses, the researcher initially assumes that the alternative hypothesis is true and uses the sample data to.
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  Multiple Choice 25. Golf course designer Roberto Langabeer is evaluating two sites, Palmetto Dunes  and  Ocean Greens, for his next golf course.  He wants to prove that Palmetto Dunes residents (population 1) play golf more often than Ocean Greens residents (population 2). Roberto plans to test this hypothesis using a random.
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True/False 1. A uniform continuous distribution is also referred to as a rectangular distribution. 2. The height of the rectangle depicting a uniform distribution is the probability of each outcome and it same for all of the possible outcomes 3. The area of the rectangle depicting a uniform distributionis always equal.
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  11.With cluster sampling, there is homogeneity within a subgroup or stratum. 12.If a researcher selects every kth item from a population of N items, then she is likely conducting a systematic random sampling. 13.If every unit of the population has the same probability of being selected to the sample, then the researcher.
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    60.Catherine Chao, Director of Marketing Research, is evaluating consumer acceptance of a new toothpaste package.  She randomly selects a sample of 200 households.  Forty households prefer the new package to all other package designs.  The point estimate for this population proportion is _______. a) 0.20 b) 0.25 c) 0.40 d) 0.45 e) 0.55 61.Catherine Chao, Director.
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  35.Lucy Baker is analyzing demographic characteristics of two television programs, American Idol (population 1) and 60 Minutes (population 2).  Previous studies indicate no difference in the ages of the two audiences.  (The mean age of each audience is the same.)  Her staff randomly selected 100 people from each audience, and.
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True/False 1. To determine if there is a difference in the speed of a wireless router from two different manufacturers  a network  manager will draw independent samples of wireless routers from the two manufacturers and compare the difference in the sample means for the connection speed. 2. The difference in two sample.
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  45.A researcher wants to conduct a before/after study on 11 subjects to determine if a new cholesterol medication results in higher HDL cholesterol readings.  The null hypothesis is that the average difference is zero while the alternative hypothesis is that the average difference is not zero.  Scores are obtained on.
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  Multiple Choice 32.Consider the following null and alternative hypotheses.               Ho:  ? ? 67               Ha:  ? > 67 These hypotheses _______________. a) indicate a one-tailed test with a rejection area in the right tail b) indicate a one-tailed test with a rejection area in the left tail c) indicate a two-tailed test d) are established incorrectly e) are.
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  24.The volume of liquid in an unopened 1-gallon can of paint is an example of _________. a) the binomial distribution b) both discrete and continuous variable c) a continuous random variable d) a discrete random variable e) a constant 25.The number of  finance majors within the School of Business is an example of _______. a) a discrete.
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  Multiple Choice 20. Suppose the number of parking spots at urban grocery stores  is uniformly distributed over the interval 90 to 140, inclusively (90 ? x ? 140), then the height of this distribution, f(x), is __________________. a) 1/90 b) 1/50 c) 1/140 d) 1/200 e)  1/500 21. If the number of parking spots at urban grocery.
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  11. If the populations are normally distributed and the variances of the two populations are not equal, it is appropriate to use the “unpooled” formula to determine the t-statistic for the hypothesis test of the difference in the two population means. 12.  In order to construct an interval estimate for.
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    50.A large national company is considering negotiating cellular phone rates for its employees. The Human Resource department would like to estimate the proportion of its employee population who own an Apple iPhone..  A random sample of size 250 is taken and 40% of the sample own and iPhone. The 90%.
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  64.The Poisson distribution is being used to approximate a binomial distribution.  If n=30 and p=0.03, what value of lambda would be used? a) 0.09 b) 9.0 c) 0.90 d) 90 e) 30 65.The Poisson distribution is being used to approximate a binomial distribution.  If n=60 and p=0.02, what value of lambda would be used? a) 0.02 b) 12 c) .
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  60.The expected (mean) life of a particular type of light bulb is 1,000 hours with a standard deviation of 50 hours. The life of this bulb is normally distributed. What is the probability that a randomly selected bulb would last fewer than 1100 hours? a) 0.4772 b) 0.9772 c) 0.0228 d) 0.5228 e) 0.5513 61.The expected.
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  Multiple Choice 27.Paige DeMarco is the Vice President for University Advancement at State University.  She is responsible for the capital campaign to raise money for the new student services building. Paige selects the first 100 alumni listed on a web-based social networking site for State University. She intends to contact these.
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True/False 1. When a statistic calculated from sample data is used to estimate a population parameter, it is called a point estimate. 2. When a range of values is used to estimate a population parameter, it is called a range estimate. 3. If the population is not normal but its standard deviation, ?.
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  34.A market research team compiled the following discrete probability distribution for families residing in Randolph County.  In this distribution, x represents the number of evenings the family dines outside their home during a week. x P(x) 0 0.30 1 0.50 2 0.10 3 0.10 The mean (average) value of x is _______________. a) 1.0 b) 1.5 c) 2.0 d) 2.5 e) 3.0 35.A market research team compiled.
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  37.Albert Abbasi, VP of Operations at Ingleside International Bank, is evaluating the service level provided to walk-in customers.  Accordingly, he plans a sample of waiting times for walk-in customers.  Albert instructs his staff to record the waiting times for the first 45 walk-in customers arriving after the noon hour.  Albert's.
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