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A researcher is interested in whether students who attend private high schools have higher average SAT Scores than students in the general population. A random sample of 90 students at a private high school is tested and and a mean SAT score of 1030 is obtained. The average score for public high school student is 1000 (σ= 200).
a. Is this a one- or two tailed test?
b. What are H0 and Ha for this study?
c. Compute Z obt
d. What is the Z critical value (Z cv ) using a 0.05 alpha level?
e. Should H0 be rejected? What should the researcher conclude?
f. Determine the 95 % confidence interval for the population mean, based on the sample mean.
Discuss why sampling is essential to many research designs, and why, if done correctly may be more accurate than attempting census measurement.
You have been given a report that presents two regression models with different numbers of independent variables. You do not have the data so you cannot re computed regression models. Nevertheless, you have been asked to find out which model is b..
Consider binomial distribution with 14 identical trials, and probability of success of 0.4.
Is the Euro fair? Soon after the Euro was introduced as currency in Europe, it was widely reported that someone had spun a Euro coin 250 times and gotten heads 140 times. We wish to test a hypothesis about the fairness of spinning the coin.
Assume that a 95% confidence interval estimate of the new annual starting salary is desired. How large a sample should be taken if we do not want to exceed $500? What do you know?
What is the difference between the mean of the two groups? What is the difference in the standard deviation?
Must you assume that the population amount of paint per can is normally distributed here? Explain
Suppose that 51% of the women who gave birth at a certain hospital last year were over 30 years old, and that 39% were unmarried.
The standard deviation of is usually called the A. randomized standard error B. standard error of the sample C. standard error of the population D. standard error of the mean
consider the following experiment a ball is drawn without replacement from an urn containing two red and three blue
Can you please explain a general strategy for factoring in a very organized way. Give an example if possible.
A recent study of the Greater Los Angeles Taxi Driver Association demonstrated that the average or media tariff that they charge from Hermosa Beach to the International Airport of Los Angeles is $18.00
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