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In a study of student loan subsidies, the Department of Education reported that four-year Stafford Loan borrowers will owe an average of $12,168 upon graduation (USA Today, April 5, 1995). Assume that this average or mean amount owed is based on a sample of 480 student loans and that the population standard deviation for the amount owed upon graduation is $2200.
a. Develop a 90 % confidence interval estimation of the mean.b. Develop a 95 % confidence interval estimation of the mean.c. Discuss what happens to the width of the confidence interval as the confidence level is increased. Does this seem reasonable? Explain.d. If you were to decrease the width of the 95% confidence interval by 25% of its current width, how much samples do you need to collect?
Estimate the probability that the next time you ride in a car, you will not be delayed because of some car crash blocking the road.
Conduct a two-tailed hypothesis test given the information below. Assuming that the population variances are equal for male and female Grade Point Averages (GPAs), use the following sample data to test.
Please explain the difference between confidence interval and significance level and how they interact or "influence" each other.
In the study of 15 taxi drivers, average experience was 11.2 years. Standard deviation was 2. At α = .10, is number of years' experience of taxi drivers really less than taxi company claimed?
Calculate mean and SS for sample of difference scores.
Choose one time-series describing Airlines and make a line chart. Describe the trend (if any) and discuss possible causes. Fit both a linear and an exponential trend to the data.
On randomly selected day, let X and Y, respectively, be proportions of time that the drive-in and walk-in facilities are in use. Determine the marginal density of X.
Create the 90% confidence interval for mean score of all such subjects. You may suppose scores are usually distributed.
A nursing professional conducts an analysis to examine scores on the mental health service and treatment outcome questionnaire.
A person decides to take a telephone survey of 40 families in the 721-exchange area (sometimes referred to as prefix). You want an excellent representation of all subscribers in the exchange area.
Given the following sample information, test the hypothesis that the treatment means are equal at the .05 significance level.
The users are then timed in their ability to setup and program the DVD by performing a series of operations. Which statistical analysis technique should be used? What is the null hypothesis? Can the market researcher get an answer? Why or why not?
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