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Let z be a standard normal random variable and calculate the following probabilities:
p (0.72is less than z which is less than 2.17)p (z is greater than -2) =p(z is less than or equal to -1.8
According to a recent poll, 53% of Americans would vote for an incumbent president. If a sample of 100 people results in 45% who would vote for the incumbent, test the claim that the percentage is 53%. Use a .10 significance level.
At the 0.01 level of significance, is there evidence to support the professor's claim?
P-value for test statistic is .085, determine the minimum level of significance needed to reject null hypothesis?
A small town has a population of 20,000 people. Among these 1,000 regularly visit a popular local bar. A sample of 100 people who visit the bar is surveyed for their annual expenditures in the bar.
For which of the following situations is it appropriate to use a scatter diagram or scatter plot?
Conduct a two-sample test of means. A study by a bank compared the average savings of customers who were depositors for three years or less with those who had been depositors for more than three years.
A vertical line is drawn through a normal distribution at z = -0.25, and separates the distribution into two sections. What proportion of the distribution is in the larger section?
The New York Times reported (L.J> Flynn, Tax Surfing, The New York Times, March 25, 2002, p. C10) that the mean time to download the home page for the internal Revenue Service (IRS) , was 0.8 second. Suppose that the download time was normally di..
Use the Empirical Rule to estimate the proportion of costs within two standard deviations of the mean. What are these limits?
According to accountemps inc. 48% of all executives believe that employees are most productive on Tuesdays. a random sample of 200 executives is taken for a study.
Prepare a frequency distribution from data given below that describes how long it took a person to drive to work in work week.
Suppose normality is not assumed. What nonparameiric test can be used to compare total heart weight of males with left-heart disease with that of normal males?
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