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A presidential candidate's aide estimates that, among all college students, the proportion who intend to vote in the upcoming election is at least 60%. If 134 out of a random sample of 235 college students expressed an intent to vote, can we reject the aide's estimate at the 0.05level of significance? Perform a one-tailed test.
Bill heats his house with natural gas. The gas usage is measured in therms (T). In January of 2007 he used 125 therms over 34 days (D) and the average temperature (T) was 49 degrees farenheit.
In a survey conducted to see how long Americans keep their cars, 2000 automobile owners were asked how long they plan to keep their present cars. The results of the survey follow. Find out the probability distribution associated with these data.
A researcher hypothesizes that individuals who listen to classical music will score differently from the general population on a test of spatial ability. On a standardized test of spatial ability, µ =58.A random sample of 14 individuals who listen..
For a sample with standard deviation of 10, a score of X = 44 corresponds to z-score of 0.50. Based on this info, determine the sample mean?
A two tailed test is conducted at 5% significance level what is the P-value required to reject the null hypothesis.
Compute the value of the sample correlation coefficient between weekly sales and shelf space. Is the correlation between weekly sales and shelf space significant at the .01 level of significance? What is the estimated regression equation?
Suppose that the results of the sample lead to rejection of the null hypothesis. Classify that conclusion as a:
Compute a 95% confidence interval for the mean difference in the percentage of bone loss between two groups.
Evidence of statistical interaction or effect modification. What is the odds ratio for diabetes in a man aged 65 compared with a woman aged 60 (both have the same waist circumference)?
Assuming no discrimination based on gender, what is the probability of getting 41 or fewer women when 100 new employees are hired?
Compute the standard error of the sampling distribution of sample means.
What is the probability that a randomly selected tire will have a life of at least 30,000 miles?
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