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Q1) In a random sample of 545 accountants engaged in preparing county operating budgets, 117 indicated that estimates f cash flow were the most difficult element of the budget to derive.
a) Test at the 5% level the null hypothesis that at least 25% of al accountants find cash flow estimates the most difficult to derive.
b) Based on the procedure used in part (a), what is the probability that the null hypothesis would be rejected if the true percentage of those finding cash flow estimates was 20%? 25%? 30%?
2) Random sample of 10 students contains following observations (in hours) for time spent studying in the week before exams:
28 57 42 35 61 39 55 46 49 38
a) Determine the sample mean and standard deviation.
b) Test at 5% significance level null hypothesis that population mean is 40 hours against alternative that it is higher.
A random sample of 20 single men was asked if they would welcome a woman taking the initiative in asking for a date. What is the probability that:
This distribution is positively skewed. The standard deviation of the population is not known.
At the .05 significance level, can we conclude that the guideline is still reasonable?
A sample of 50 male and 50 female infants were put on an experimental infant formula. After two weeks the parents of each infant were asked to fill out a questionnaire concerning infant satisfaction on the formula. One of the questions was "Did Ba..
Following data represent random sample of bank balances for population of checking account customers at large eastern bank. Based on data, determine the 95 percent confidence interval estimate for true population mean?
Sample of 36 packages reveals mean weight to be 3.01 pounds, with standard deviation of 0.03 pounds. What is the estimated population mean?
For a t distribution with 16 degrees of freedom, find the area, or probability, in each region.
A researcher used stepwise regression to create regression models to predict Birthrate (births per 1000) using five predictors:
Determine the lowest weight a student can have and still be qualified to enter the school.
Utilize this information to construct a probability table, and then calculate each of the given probabilities:P (female and domestic car).
Graph the least-squares line on your scatter diagram. Be sure to use the point (x, y) as one of the points on the line.
Plot stem-and-leaf plot and boxplot for Mtotal. Illustrate hand calculation of median location and upper hinge location of boxplot, and determine their corresponding data values.
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