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After computing a confidence interval, the user believes the results are meaningless because the width of the interval is too large. Which one of the following is the best recommendation?
a. Increase the level of confidence for the interval.
b. Decrease the sample size.
c. Increase the sample size.
d. Reduce the population variance.
A method of determining if relationships exist between two variables is:
What type of research design is the strongest when I what to adopt a new educational program? Using a pre-test and post-test with control group, the previous method but without the control group.
Bob throws six dice and wins if he scores at least one ace. Alice throws 12 dice and wins if she scores at least two aces. Who has the greater probability of winning?
Describe a different example of where the independent variable, while highly correlated to the dependent variable, does not cause the dependent variable to change directly.
Their monitoring plan will take a random sample of 5 days sales per month and use the sample mean sales to identify shops that are under-performing. Establish the lower limit sales such that only 5% of the shops would have a sample sales mean belo..
Generate a 95% confidence interval for the difference in mean HDL levels between men when exercise regularly and those who do not.
kelly bought 8 apples3 pears and 13 oranges and brought them home in a grocery bag. if she picks one from the bag
Under the new structure of the sample, how will the answers to a, b, and c change and create a 95-percent confidence interval for the average distance of Brand A
The New York Times recently reported that 60% of college entrants into elite public and private colleges in the U.S. have parents that earn over $150,000/yr.
Suppose the probability of suffering a side effect from certain flu vaccine is 0.005. If 1000 persons are inoculated, find the approximate probability that: At most 2 persons suffer.
According to Chebyshev's Theorem, how many students scored between 24 and 78? Assume that the distribution is normal. Based on the Empirical Rule, how many students scored between 24 and 78?
Assume your statistics professor reports test grades as z-scores, and you got a score of 2.20 on the midterm exam. Write down a sentence explaining what that means.
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