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Study Resources (Statistics)

  55) A ________ sample is used when members of the population are chosen to become part of the sample simply because they are easily accessible. A) cluster B) convenience C) probability D) stratified 56) The average weight of the entire batch of the boxes of cereal filled today was 18.03 ounces. A random sample of.
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  1) A hypothesis is an assumption about a population parameter such as a mean or a proportion. 2) The alternative hypothesis, denoted by H0, represents the status quo and involves stating the belief that the population parameter is, ≤, =, or ≥ a specific value. 3) The alternative hypothesis, denoted by H1,.
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  140) The power of the hypothesis test is the probability of it A) correctly rejecting the null hypothesis. B) incorrectly rejecting the null hypothesis. C) correctly rejecting the alternative hypothesis. D) incorrectly rejecting the alternative hypothesis. 141) AT&T would like to test the hypothesis that the average revenue per retail user for Verizon Wireless customers.
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  75) Taylor's Mill is a neighborhood comprised of 185 homes. According to the website Zillow, the average market value of the homes in this neighborhood is $418, 300 with a standard deviation of $36,500. What is the standard error for a random sample of 32 homes from this neighborhood? A) $4,153.87 B).
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  143) The Centers for Disease Control and Prevention reported that 19% of U.S. adults are cigarette smokers. A random sample of 160 adults contained 42 smokers. Use a 90% confidence interval to confirm the findings of the Centers for Disease Control and Prevention. 144) The U.S. Department of Transportation would like.
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  1) Measuring the entire population is usually preferred over measuring a sample from the population. 2) Sampling without replacement means that once a member of a population is chosen for a sample, it cannot be chosen again for the same sample. 3) Excel's random sampling tool uses sampling with replacement. 4) With systematic.
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  137) The percentage of companies that use social-media tools and technologies has been increasing over the past several years. A random sample of 170 companies found that 78 of them use social-media tools and technologies. Determine the 80% confidence interval for this sample. 138) The percentage of companies that use social-media.
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  120) Many hotel chains that offer free Wi-Fi service to their customers have experienced increasing demand for Internet bandwidth and increasing costs. Marriott International would like to test the hypothesis that the proportion of customers that are carrying two Wi-Fi devices exceeds 0.40. A random sample of 130 Marriott customers.
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  116) Tire Kingdom installs automobile tires on a first-come first-served basis. A random sample of 70 customers experienced an average wait time of 102.7 minutes. Assume that the standard deviation of total wait time for all customers is 17.0 minutes. Determine the 95% confidence interval for this sample. 117) Suppose a.
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  126) According to College Board, the average out-of-state tuition for a four-year public college was $20,770 for the 2011-2012 academic year. There are a total of 629 four-year public institutions in the U.S. Assume that the standard deviation for the tuition for these colleges is $2,100. A random sample of.
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  139) Franklin Township has 730 registered Democrats residing in the voting district. According to the voting records, 37% participated in the last local election. A random sample of 180 registered Democrats was selected. What is the probability that 54 or fewer of these individuals voted in the recent election? 140) Davidson.
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  62) According to Pew Research Center, 71% of Internet users accessed video-sharing sites in August 2011. A random sample of 50 Internet users was selected. Using the normal approximation to the binomial distribution, what is the probability that 37 or more people from this sample access video-sharing sites? A) 0.1492 B) 0.2676 C).
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  95) According to IDC, Apple's share of the smartphone market was 20% during the 3rd quarter of 2011. A random sample of 115 smartphone users was selected. The standard error of the proportion is ________. A) 0.0157 B) 0.0373 C) 0.0690 D) 0.1016 96) The No Child Left behind Act of 2001 (NCLB) established standards-based.
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