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If 200 of the adults surveyed were in the age category of 24 and under and they provided a standard deviation of $14.50, construct a 95% confidence interval for the weekly average expenditure on fast food for adults 24 years of age and under. Assume fast food weekly expenditures are normally distributed.
Best Electronics, Inc. offers a "no hassle" returns policy. The number of items returned per day follows the normal distribution. The mean number of customer returns is 10.4 per day and the standard deviation is 2.3 per day.
Computing the Z scores for the given data and evaluate µ and σ for the population.
Cores on two tests have a bivariate normal distribution; and that correlation of 2 scores is 0.8. Determine the probability that sum of the student's scores on 2 tests will be greater than 200?
What is the rejection point at α = .01 and indicate if you would accept or reject H o ?
Using the letter M for male and F forfemale. Define a second sample space S and where the elements represent the number of females selected.
The lapping process, which is used to grind certain silicon wafers to the proper thickness, is acceptable only if 'sigma', the population standard deviation of the thickness of dice cut from the wafers, is at most 0.50 mil.
The following frequency table lists the sales of an item and the number of times it has occurred. It was obtained from historical records. Sales/Frequency: 10/100, 15/120, 20/300, 25/350, 30/400, 35/500, 40/300, 45/170.
Assume your statistics professor reports test grades as z-scores, and you got a score of 2.20 on the midterm exam. Write down a sentence explaining what that means.
Change the frequencies to percentages - is there a group more likely to get high salaries.
The probability is 90% that the sample percentage is contained within what symmetrical limits of the population percentage?
Using the original data, test at the 5% significance level that the population standard deviation of studying times is greater than 4 hours.
Write a brief summary of the distribution of life expectancy.
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