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The distribution of the height of students in a large class is roughly bell-shaped. The average height is 68 inches, and approximately 95% of the heights are between 62 and 74 inches. Thus, the standard deviation of the height distribution is approximately.
High levels of glucose in the blood are indications of diabetes, which is becoming more prevalent in the United States. Diabetes can lead to many complications such as blindness and heart disease. A random sample of 180 individuals had their blood su..
A traffic study at one point on an interstate highway shows that vehicle speeds are normally distributed with a mean of 61.3 mph and a standard deviation of 3.3 mph.
For each of the following statistical tests, state the null hypothesis and the two sided alternative hypothesis.
Consider the following stemplot. The mean of the data represented in this stemplot ?
Give the Z- score cutoff (or cutoffs) on the comparison distribution at which the null hypothesis should be rejected
In chi-square goodness-of-fit test when there is close agreement between observed frequency and expected frequency, chi-square test value will be small.
The store manager is under impression that his sales people do more business if they score higher on the social skills test which was administered this year. 5 victims were selected at random. Below, the results are X =test score, Y =weekly sales ..
Find the probability that one or more of the five parolees will be repeat offenders. (Round your answer to three decimal places.)
Find out the following probabilities. Probability that exactly 27 items will be good.
A sample of 148 of our statistics students rated their level of admiration for Hilary Rodham Clinton on a scale of 1 to 7. The mean rating was 4.06 and the standard deviation was 1.70.
Determine critical path and project completion time. Determine the probability that the project will be finished in 70 days or less. Determine the probability that the project will be finished in 80 days or less
Assuming that all other variables are held constant, explain how the value of z influenced by each of the following:
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