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In a poll of 100 adults, 45% reported they believed in "faith healing." (USA Today, 20 April 1998). Based on this survey, a "95% confidence interval" for the proportion in the population who believe in faith healing is about 42% to 48%. If this poll had been based instead on 5000 adults, do you think the "95% confidence interval" would be wider or narrower than the interval given?
Use this information to find the upper and lower limits of the first class if you wish to construct a frequency distribution with 10 classes.
When 500 college students are randomly selected and surveyed, it is found that 135 of them own personal computers (based on data from the America Passage Media Corporation).
Horace Mann, principal of Jones Public School, has decided to construct a time series model to obtain a 2- and a 3-period moving average to forecast student enrollments for next term.
A prof. can't decide how to vote on a tuition increase for the students at her univ. The incrase is supposed to pay for new student parking and there appears to be mixed feelings. The prof.
Choice of exponential smoothing constant w has little or no effect on forecast values using exponential smoothing.
Construct the 95% confidence interval estimate of the mean number of migraine attacks for those treated with acupuncture.
Advertisers need to know which age groups are likely to see their ads. Purchasers of 120 copies of Cosmopolitan are shown by age group.
If die is loaded so that 6 comes up with probability 0.2 and probabilities of 2,3,4, and 5 faces are not affected, determine the assignment of probabilities to the six faces?
You create a 95% confidence interval for your average score and it is (76.347, 79.133). Given this information, what is the best conclusion?
Explain finding value of test statistic for the given data also interpret the result. Can Mr. Ratter compute which the mean weight of the bags is less than 50 pounds.
At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. Is this a test of sample means or sample proporti..
If you are dealt 3 cards from a shuffled deck of 52 cards, find the probability that all 3 cards are queens. A fair coin is tossed 8 times in succession. Find the probability of getting at least 4 heads.
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