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Humanities majors spend an average of $115 per course on books. Mathematics majors spend an average of $70 per course on books.
What is the percent difference between the two amounts relative to the amount for mathematics majors (round to the nearest percent)?
Create a 95 % confidence interval for the true mean. Why might normality be the issue here?
Do the data provide significant support for any preferences among the three brands? Test At the .05 level of significance.
What does the coefficient of determination tell you about the variation in attendance and the variation in the number of exhibitors?
Based on the answers to a through d, decide whether or not to reject the null hypothesis at the given significance level. Explain your conclusion in the context of the problem.
Mention your decision regarding the null hypothesis. If H 0 rejected can we conclude that treatment 2 and treatment 3 differ? Use 95 percent level of confidence.
Toledo, OH has been experiencing improved economic growth following huge capital investments from companies like Chrysler. You have just been hired by RGP, an agency for facilitating business expansion and location in the Toledo metropolitan area.
Determine the average and the variation for Brand 1 price, sales market share, and total revenue, using the weekly market survey data (descriptive statistics).
What is the p-value associated with the sample results? What is your conclusion based on the p- value?
Compare your best difference to the result from an ordinary two-sample t-test between these groups. Comment the difference.
Assume that the standard deviation of college student IQ's is 10. A random sample of 100 students from a college showed an average IQ of 110. Compute a 95% confidence interval for the mean IQ of students attending this college.
Assume if random samples of size n = 9 are selected can we say anything about the distribution of sample means.
A processor of carrots cuts green top off each carrot, washes the carrots, and inserts six to a package. Twenty packages are inserted in a box for shipment. To test weight of the boxes, a few were checked.
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