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A particular survey indicated that 81% of 16-to 25-year-olds had getting rich as a goal as compared to 62% of 26-to 35-year olds. Suppose that the survey was based on 300 respondents from each of the two groups. (a) What is the probability that a randomly selected respondent has a goal of getting rich? (b) Are the events "age group" and "has getting rich as a goal" independent? Explain.
Assume that the population is normally distributed. Can we conclude at the 0.01 level of significance that the mean waiting time on special orders at this furniture store exceeds 28 days? Perform a one-tailed test.
The Aloha Banking Co. is studying ATM use in suburban Honolulu. A sample of 30 ATM's showed they were used the following number of times yesterday.
The Skateworld Company operates ice rinks in several major cities throughout the United States. During each session of open skating, one customer is selected at random to receive a free pass for a future open skating session.
Divide your data in half, your first 8 observations and your last 7 observations. Then use ANOVA to test to see if there is a significant difference between the two halves of your data. This list of Webpages that Perform Statistical Calculations h..
Mention all samples of size 3, and compute the mean of each sample. Compute the mean of the distribution of sample means and the population mean.
The null hypothesis is the alternative is Use the given sample data to find out the P-value for the hypothesis test. Provide an interpretation of the P-value.
Assuming that the distribution of the costs is normal, what is the probability that the average for this sample is between $400 and $425?
What is the probability that at least one inspector will find a defective widget?
If the average price of a new home is 145,000 what is the minimum and maximum prices of the houses a contractor will need to build to include the middle 80% of the market.
Group suspects that local shopkeeper's 10g packs is actually less than wt. The group took sample of 40 whose mean wt is 9.95 and s.d. of 0.15. Find p-value for the test of hypothesis.
How much does a typical employee and his or her family spend per year on dental expenses? Construct a 95 percent confidence interval for the population mean. Interpret the interval.
The mean change score for the sample studied is an increase of 5.2. What is considered a medium effect size for a t test for dependent means?
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