Cadbury, Inc., is interested in estimating people's responses to a new chocolate. The company believes that people in different age groups differ in their preferences for chocolate. The company believes that in the region of interest, 25% of the population is children, 55% are young adults, and 20% are older people. A proportional allocation of a total random sample of size 1,000 is undertaken, and people's responses on a scale of 0 to 100 are solicited. The results are as follows. For the children, x̄ = 90 and s = 5; for the young adults, x̄ = 82 and s = 11; and for the older people, x̄ = 88 and s = 6. Give a 95% confidence interval for the population average rating for the new chocolate.
Answer to relevant QuestionsThe following data are annualized returns on a group of 15 stocks. 12.5, 13, 14.8, 11, 16.7, 9, 8.3, -1.2, 3.9, 15.5, 16.2, 18, 11.6, 10, 9.5 Find the median, the first and third quartiles, and the 55th and 85th percentiles ...Find the mean, median, and mode(s) of the observations. 2, 3, 2, 4, 3, 5, 1, 1, 6, 4, 7, 2, 5, 1, 6 For problem 16-24, suppose that it costs twice as much money to sample a child as the younger and older adults, where costs are the same per sampled person. The company believes that in the region of interest, 25% of the ...Israel's kibbutzim are by now well diversified beyond their agrarian roots, producing everything from lollipops to plastic pipe. These 282 widely scattered communes of several hundred members maintain hundreds of factories ...What is a hit ratio? Will a hit ratio of 67% be sufficient when one group has 100 observations, another group has 200 observations, and the ratio of these groups is believed to reflect their ratio in the population? Explain.
Post your question