1-20chapter stats

Three years ago a major hotel chain purchased a large

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Unformatted text preview: 40 D. H0: Md ≤ 40 1-1789 Chapter 01 - An Introduction to Business Statistics 85. The claim of the manufacturer of cell phone batteries is that the median life of a battery is more than 40 hours. Suppose a random sample of 75 batteries finds that 32 have a life of more than 40 hours. Using α = .05, can we conclude that the battery life is more than 40 hours? A. Reject the null hypothesis, z = 1.38 B. Fail to reject the null hypothesis, z = 1.38 C. Reject the null hypothesis, z = -1.38 D. Fail to reject the null hypothesis, z = -1.38 86. The claim of a local real estate agent is that the median selling price of homes in a major Midwestern city is more than $200,000. Suppose a random sample of 100 homes sold in the last six months is taken and 53 sold for over $200,000. State the null hypothesis to test the claim. Assume that the population of selling prices is not normally distributed. A. H0: Md ≤ 200000 B. H0: Md ≥ 200000 C. H0: Md ≠ 200000 D. H0: Md > 200000 87. The claim of a local real estate agent is that the median selling price of homes in a major Midwestern city is more than $200,000. Suppose a random sample of 100 homes sold in the last six months is taken and 53 sold for over $200,000. Using = .01, test the real estate agent's claim. What do you conclude about the selling prices of the homes? A. Reject the null hypothesis B. Fail to reject the null hypothesis 1-1790 Chapter 01 - An Introduction to Business Statistics 88. Two coffee-vending machines are studied to determine whether they distribute the same amounts. Samples are taken and the number of ounces is recorded for each machine. What is the appropriate null hypothesis for the claim that they distribute the same amount of coffee? A. H0: µDA ≥ µDB B. H0: µDA = µDB C. H0: µDA ≤ µDB D. H0: µDA ≠ µDB 89. Two coffee-vending machines are studied to determine whether they distribute the same amounts. Samples are taken and the number of ounces is recorded for each machine. Calculate the value of TA and TB A. 117,93 B. 131,79 C. 55,105 D. 105,55 1-1791 Chapter 01 - An Introduction to Business Statistics 90. Two coffee-vending machines are studied to determine whether they distribute the same amounts. Samples are taken and the number of ounces is recorded for each machine. What is the test statistic T? A. 117 B. 93 C. 131 D. 79 91. Two coffee-vending machines are studied to determine whether they distribute the same amounts. Samples are taken and the number of ounces is recorded for each machine. On the average, can it be concluded that the machines distribute the same amount? Test at = .05 A. Reject the null hypothesis B. Fail to reject the null hypothesis 1-1792 Chapter 01 - An Introduction to Business Statistics 92. A student is trying to decide if it is cheaper to order blank CDs over the internet or to buy them at local electronic stores. Listed below are the prices (in dollars) quoted for boxes of 200 blank CDs from various manufacturers. Set up the alternative hypothesis for the claim that buying over the Internet (I) is cheaper than buying from the local electronics stores (E). A. HA: DI is shifted to the right of DE B. HA: DI is shifted to the left or right of DE C. HA: DI is shifted to the left of DE D. HA: DI is identical to DE 1-1793 Chapter 01 - An Introduction to Business Statistics 93. A student is trying to decide if it is cheaper to order blank CDs over the internet or to buy them at local electronic stores. Listed below are the prices (in dollars) quoted for boxes of 200 blank CDs from various manufacturers. Calculate the value of TI and TE. A. 60, 190 B. 125, 60 C. 111,190 D. 111,125 94. A student is trying to decide if it is cheaper to order blank CDs over the internet or to buy them at local electronic stores. Listed below are the prices (in dollars) quoted for boxes of 200 blank CDs from various manufacturers. What is the test statistic T? A. 111 B. 190 C. 60 D. 120 1-1794 Chapter 01 - An Introduction to Business Statistics 95. A student is trying to decide if it is cheaper to order blank CDs over the internet or to buy them at local electronic stores. Listed below are the prices (in dollars) quoted for boxes of 200 blank CDs from various manufacturers. On the average, can it be concluded that Internet purchases are significantly less than electronics store purchases? Test at = .05 A. Reject the null hypothesis, Internet purchases are less than local stores B. Fail to reject the null hypothesis, not enough evidence to show that Internet purchases are less than local stores 1-1795 Chapter 01 - An Introduction to Business Statistics 96. A study was conducted to investigate the effect of an intervention protocol on IQ tests. Nine randomly selected students were tested. Set up the alternative hypothesis for the claim that the intervention protocol is effective in increasing scores. A. H0: The probability distribution of test scores before and after the intervention protocol is identical. B. H0: The probability distribution of test scores...
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