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An investigation of the effectiveness of a training program to improve customer relationships included a pre-training and post-training customer survey. What is the value of the test statistic, t?
A study by a bank compared the average savings of customers who were depositors for three years or less, with those who had been depositors for more than three years. Calculate the test statistic, z
Decide if the sample data supports the claim that the mean diameter is 50 millimeters. Use a 0.02 level of significance. State the null and alternative hypotheses. State the decision rule.
State the null and alternative hypotheses. State the decision rule. Based on the sample data, state your decision in terms of the null hypothesis (reject or not reject).
The data was used to make inferences regarding students taking other sections of the same course. Below is the data. Compute 95% confidence intervals. What does this tell us?
Compute a 99 percent confidence interval based on this sample's data. How do these students compare to the national sample?
Compute a 95 percent confidence interval for this data. What does this information tell you about a particular individual's stage IV sleep?
What is the optimal allocation of investment funds among stocks, bonds, mutual funds and cash? What is the annual rate of return and the total risk for the optimal portfolio?
The probability distribution of the random variable X. Find the average number of defects for a batch of chocolate chip cookies individually wrapped packages.
What is the probability that the waitress will refuse to serve alcoholic beverages to only 2 minors if she randomly checks the IDs of 5 students from among 9 students of which 4 are not of legal age
Calculate the probability that in the next 5 robberies notified to the San Juan Police Officers, exactly 2 of robberies were due to the need of money to buy drugs.
These data are shown here. Is this sufficient evidence to support the courier's advertisement, at the 5% level of significance?
Assuming this average holds for a small factory that employs 12 workers, what is the probability that during any given week: no worker will be absent.
Determine if there is a difference in gas prices between Ontario and Quebec. Use a test significance level of 0.01 and p-value approach. Clearly state hypothesis to be tested and conclusions.
How many incorrectly stapled handouts would have to be in the sample of 120 for you to change your conclusion in (a)? Round to whole handouts?
USFEC rents the flatbed trailers on which the organizations participating in the parade build their floats. What is the smallest level of significance that would have resulted in rejecting the null hy
Now, here's an interesting twist. If the same sample proportion was found in a sample twice as large-that is, 1150 out of 2560-how would this affect the confidence interval?
Tim's annual fixed cost for space, equipment, and supplies is $61,000. Which is the preferred process for Tim, and why?
Most airlines charge a fee for baggage that weigh in excess of 50 pounds. Determine what percent of airline passengers incur this fee.
Can we accept the hypothesis that the sample is a random sample from a population with a mean greater than 72? Use alpha = 0.01(1-tail) in making your decision.
Is there evidence that the actual proportion of local commuters car-pooling is less than national level. Also find and interpret the p-value of this test.
Calculate the F statistic to compare this reduced model to the full model above and verify that it is equal to the square of the appropriate t test statistic in the full model.
Based on this test, can you conclude that there is a relationship between consecutive values of your variable? Defend your answer.
How many free throws must the second player make in a row in order to confidently reject the same null hypothesis? Use the 95% level of confidence for both players.
Calculate confidence intervals around the P and Q percentages using the following sample data: P = 75% , Q = 25% n= 678 @ 95% level of confidence.