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The mean and the standard deviation of the sample of 100 bank customer waiting times in Table 1.8 are (xbar=5.49) and s=2.317. Calculate a t-based 95 percent confidence interval for U, the mean of all possible bank customer waiting times using the new system. Are we 95 percent confident that U is less than six minutes?
I have been approached by a pharmaceutical company that has developed a new drug, which is supposed to be effective in the treatment of schizophrenia.
An orange juice producer buys all their oranges from one particular orchard. The amount of juice from the oranges is approximately normally distributed with a mean of 152 ml. and a standard deviation of 41 ml.
If there is a +.20 correlation between SAT scores and high school GPA, SAT scores account for what % of the fluctuation in GPA?
An ANOVA procedure is used for data that was obtained from four sample groups each comprised of five observations. The degrees of freedom for the critical value of F are:
Name six virtues and characteristics of problems and hypothesis. Name some tips for identifying and developing formal research problems.
Determine the point estimate in this study? Compute the standard error in this example?
Illustrate that probability distribution of X satisfies properties of a discrete probability distribution.
Large university health system, 55 of 120 randomly selected physicians were women. Find the critical values to two decimal places if alpha=0.05.
Bob throws six dice and wins if he scores at least one ace. Alice throws 12 dice and wins if she scores at least two aces. Who has the greater probability of winning?
Find the mean, median, mode, sample variance, and range. Do you think that this sample might have come from a normal population? Why or why not?
Suppose you know that the distribution of sample proportions of nonresidents in samples of 200 students is normal with a mean of 0.04 and a standard deviation of 0.03.
q1. average adult american are about one inch taller but nearly a whopping 25 pounds heavier than they were in 1960
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