Using Cochran's Formula, b) Using FPC for Proportions, and c) Yamane's Formula. d) Which among the three produced the highest number of samples?
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- The Canadian Chiropodists Society states that 36 % of women wear shoes that are too small for their feet. A researcher wants to be 98 % confident that this proportion is within 0.02 of the true proportion. How large a sample is necessary? A.) 5,423 B.) 3,117 C.) 1,745 D.) 4,270The lengths (in kilometers) of a random sample of 20 rivers on the South Island of New Zealand that flow to the Tasman Sea are listed in table below. Lengths of Rivers (in km) 177 56 76 68 56 For the data shown above, find the following. Do not round any of your answers. The program here will take either answer. a) Find the 5-number summary: b) Compute the IQR. c) What is the lower fence for this data set? |} What units would go on each of your answers above? What is the upper fence for this data set? 32 40 72 37 108 64 56 51 64 32 35 72 48 80 64Use the Normal model N(1183,74) for the weights of steers. a) What weight represents the 35th percentile? b) What weight represents the 94th percentile? c) What's the IQR of the weights of these steers? a) The weight representing the 35th percentile is nothing blank pounds?
- 7) Estimate the proportion of all households that are very satisfied from the house they are living (question 16 of the survey).60% of students entering four-year colleges receive a degree within six years. Is this percent smaller than for students who play intramural sports? 128 of the 220 students who played intramural sports received a degree within six years. What type of test should you use? A) z-test for population mean B) z-test for population proportion C) t-test for population meana programmer plans to develop a new software system. In planning for the operating system that he will use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be 99% confident that his estimate is in error by no more than three percentage points? Complete parts (a) through (c) below. a) Assume that nothing is known about the percentage of computers with new operating systems. n = b) Assume that a recent survey suggests that about 98% of computers use a new operating system.n = c) Does the additional survey information from part (b) have much of an effect on the sample size that is required?
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