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A teacher finds that the scores of a particularly difficult test were normally distributed with a mean of 76 and standard deviation of 14. If a score of below 60 represents a grade of F, what percent of students failed the test? how many points must be added to the students' score so that only 5% fail?
suppose a manufactuirng company make a certain item. the time to produce each item is normally distributed around a
Under the assumption that co payment amounts are normally distributed, find a 99% confidence interval for the mean amount in dollars.
use a significance level of a0.05 to test the claim that p1p2. use the given sample sizes and numbers of successes to
Assume a business researcherwishes to test hypothesis that greater proportion of marketing managers keep track of such obligations.
Give an example of a situation in which multiple linear regression, discriminate analysis, canonical correlation, and multivariate analysis of variance might be used.
Obtain descriptive statistics and graphic displays for these salt taste indices. Do the indices appear to be normally distributed? Why or why not?
mean of peak expiratory flow for children without asthma is 306. investigator wants to see whether children with
it is decided to measure the resistance of sheets of a certain metal at temperatures x of 100k 200k 300k 400k and 500k.
He reviews the last eight months at dealership B and finds the standard deviation of the eight monthly sales to be 22.95. Using the .01 significance level does the analyst find evidence that the boast of dealership A is correct?
in 2010 a gallup poll surveyed 1016 households in the u.s about their pets. of those surveyed 599 said they had at
suppose the u.s. president wants an estimate of the proportion of the population who support his current policy toward
q1. a chi-square test for independence with 8 degrees of freedom results in a test statistic of 18.21. usingthe
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