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Conduct a two tailed hypothesis test given the information below.Assuming that the population standard deviations are unknown but equal for male and female GPA, use the following sample data to test whether the GPA are different at the 0.05 level of significance.
Male GPA Sample size 13 Sample mean 3.6 Sample standard dev 0.4 Female GPA Sample size 16 Sample Mean 3.8 Sample standard dev 0.7
Find the value for the correlation coefficient r.
Calculate separately for 1983 and 1987, the 95% confidence interval for the proportion of students who had driven an automobile while drinking.
Of the nine members of the board of trustees of a college, five agree with president on a certain issue. The president selects three trustees at random and asks for their opinions. What is the probability that at least two of them would agree with..
Suppose Abraham Lincoln had answered a survey questionnaire in which he indicated that he had not received a grade school diploma. The researcher found that Lincoln's educational score did not correlate with the expected variables. What was wrong?
Using the data for women, complete an analysis of CHD incidence in women similar to the one completed for men.
How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.2 pounds?
Generate a relative frequency histogram using ten-point intervals to show the distribution of the scores.
We wish to create this mean value interval for selling price with 95% confidence level. Find out the best point estimate (average) for selling price. Critical t-value(s) associated with 95% confidence level.
Given are the numbers of times the machine was used over each of the last 30 days. Find out the mean number of times the machine was used per day.
What is the 95 percent interval for the population mean?
Soft Drinks a vending machine automatically pours soft drinks into cups. As the amount of soft drink dispensed into a cup is normally distributed
what is the chance the average contents of the cans will be less than advertised and what will be the standard deviation of the number of men who help at home, based on the first survey
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