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A food inspector, examining 12 jars of a certain brand of peanut butter, obtained from the fofollowing percentages of impurities: 2.3, 1.9, 2.1, 2.8, 2.3, 3.6, 1.4, 1.8, 2.1, 3.2, 2.0 and 1.9. Based on the modification of Theorem 11.1 of Exercise 11.7, what can she assert with 95% confidence about the maximum error if she uses the mean of this sample as an estimate of the average percentage of impurities in this brand of peanut butter? Theorem 11.1: If X(with the bar over it), the mean of a random sample of size n from a normal population with the known variance sigma squared, is to be used as an estimator of the mean of the population, the probability is 1-alpha that the error will be less than z alpha/2 times sigma/square root of n. Exercise 11.7: Modify Theorem 11.1 so that if can be used to appraise the maximum error when sigma squared is unknown. (Note that this method can be used only after the data have been obtained.)
A department store, on average, has daily sales of $28,707.47. The standard deviation of sales is $1000. On Tuesday, the store sold $34,650.77 worth of goods. Find Tuesday's z score. Was Tuesday an unusually good day?
at a track and field tournament freds long jumps vary evenly from 6.5 to 7.2 meters. let x be the length of freds long
the per-store daily customer count i.e. the mean number of customers in a store in one day for a nationwide
Inmates who are in the state facility and 9 who have legal satisfaction scores of 5 or more. How do determine the probability for this because I have come up weird numbers.
The medical school at a university, if 10 medical students are randomly selected for that school. find the probability that only 4 of them will graduate.
Estimate the mean monthly rent paid by the whole student population. what is the probability that the sample mean exceeds the population mean by more than %5.
suppose that x has a binomial distribution with parameters n and p.determine the moment generating function and use it
when only concerned about the results at one end of the distribution curve we use a one-tail test. we generally see a
Determine a forecast for the average weekly sales in year 5 for each of the three seasons.
an experiment is conducted in which 60 participants each fill out a personality test but not according to the way they
americans spend over 30 billion dollars on a variety of weight-loss products and services. in a study of retention
use the mann-whitney table to find the critical values. for a left -tailed or two-tailed test you will alsoneed the
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