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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.
On a test whose distribution is approximately normal with a mean of 50 and a standard deviation of 10, the results for three students were reported as follows:
Calculate the value of chi-square. What is your decision regarding H 0 ?
White blood cell counts for a group of volunteers before being innoculated, and white blood cell counts for a second group of volunteers after being innoculated.
A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national rate is 20%.
AU Cellular believes their sales are more consistent than their rival Softbank Cellular. Below is the number lost calls a day over the last seven days. Do you agree with AU? Use the .01 significance level.
Could this information be viewed as representing the ratio scale of measurement? If so , explain why. If not, why not.
Our customers expect a call to be completed in 22 minutes. Using the data above, does either of our call centers meet this expectation with an alpha level of 0.05?
Weight of the .5 cubic yard bag of landscape much is normally distributed with mean of 40 pounds and standard deviation of 1. Determine the probability that the bag will weigh more than 40 pounds?
Find the best point estimate of the mean salary of all NCAA football coaches.
Create a 95 % confidence interval for the true mean. Why might normality be the issue here?
Explain the importance of random sampling. What problems/limitations could prevent a truly random sampling and how can they be prevented?
Assume that sigma = 60, choose an alpha level, and perform a hypothesis test to determine whether this is good evidence to conclude that the mean score for all young men is less than 275.
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