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The average amount of precipitation in Dallas, Texas, during the month of April is 3.5 inches (The World Almanac, 2000). Assume that a normal distribution applies and that the standard deviation is .8 inches.
a. What percentage of the time does the amount of rainfall in April exceed 5 inches?
b. A month is classified as extremely wet if the amount of rainfall is in the upper 10% for that month. How much precipitation must fall before a month of April is classified as extremely wet?
Do these scores suggest that the different foods are differentially preferred by people in general? (Use the .05 significance level.)
Define the terms parameter and statistic. Be sure that the concepts of population and sample are included in your definitions.
EBook is a digital book provider that sells their downloaded product through both Anason and Bairnes-Nolb. Anason requires that EBook use a different format than they use for Bairnes-Nolb.
What type of error would result in that case? Respond to at least two of your classmate's postings.
A business researcher uses two-way ANOVA in a report for a client. The researcher does not check the assumptions of using the technique.
Your regional manager is impressed with how you've employed spreadsheets to aid your small company in saving time and more accurately figuring out payroll amounts.
Compute the mean and variance of the following discrete probability distribution.
Determine the maximum error of the estimate, E. Determine the confidence level used for the given confidence interval.
A month of sales data are collected on sales of different types of computer products Run the t-tests to determine:
Assume a random sample of 16 gasoline stations is selected and their mean cost for regular gasoline is computed. What is the standard error of the mean in this experiment?
A recent study indicated that 29% of the 100 women over age 55 in the study were widows. If no estimate of the sample proportion is available how large should the sample be?
Stock A has an expected return of 12% and a standard deviation of 40%. Stock B has an expected return of 18% and a standard deviation of 60%. The correlation coefficient between Stocks A and B is 0.2.
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