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A researcher wants to gauge public opinion on gun control. He randomly selects 1000 people and asks: "Do you believe that gun control laws which restrict the ability of Americans to protect their families should be eliminated?"
(a) Determine the type of bias. (Mention one of the types of bias from section 1.5.)
(b) Suggest a way the researcher's methods could be improved to eliminate the bias.
Results of study are summarized below. Use a 5% level of significance and test claim that opinion is independent of brand.
List all samples of size 2, and compute the mean of each sample. Compute the mean of the distribution of sample means and the population mean. Compare the two values. Compare the dispersion in the population with that of the sample means.
The iq test score are normally distributed with a mean of 100 and a standard deviation of 15. Determine the probability that the person would score 130 or more on the test?
Conduct the standard hypothesis test procedure and answer the following: What is the null hypothesis? What is the alternate hypothesis?
Find out the confidence interval for the population mean also interpret the result. A researcher is interested in whether social assertiveness might be influenced by training procedures.
One state lottery has 500 prizes of $1, 75 prizes of $15, 15 prizes of $100, 5 prizes of $450, 2 prizes of $1225, and 1 prize of 2500. Assume that 28,000 lottery tickets are issues and sold for $1. What is the lottery's expected profit per ticket?
Which of the following statements is true regarding a nonparametric test?
One school found that 28.6% of all students are liberal. You wonder whether this percentage is different at your school, but don't know whether it's higher or lower. What hypotheses will you test to see if your school significantly differs from th..
Four of calculators are selected to be sent to local high school. How many selections can be made using original shipment?
Determine what analysis would you do on each problem (i.e., one-sample z-test, one-sample t-test, proportion test, two-sample independent t-test, or paired test)?
Why are quasi-experimental designs used more often than experimental designs?
The Dean of Students believes that the costs are greater this semester. What is the test value for this hypothesis?
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