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A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years. A random sample of 600 young adults not enrolled in college was selected and 150 of them had at least one motor vehicle accident in the previous two years. At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. Is this a test of sample means or sample proportions?
Find the lowest possible score a candidate can score and still qualify. Assume the scores are normally distributed.
A arbitrary sample of 8 students is selected. Illucidate the probability that among the students in the sample at least 7 are female.
Which statistical analysis technique should be used? What is the null hypothesis? Can an analysis be performed? Why or why not?
When the level of confidence and sample size remain the same, a confidence interval for a population proportion π will be __________ when p(1-p) is larger than when p(1-p) is smaller.
Suppose the weights of full boxes of a certain kind of cereal are normally distributed with a population standard deviation of 0.29 ounces.
One of the most important uses of a correlation is its potential use in_________
If Kim expects to use phone for 21 hours per month, which plan must she choose?
If the top 15% of the test scores are usually good enough for admission to law school, find the cut off score for gaining admission.
Suppose population standard deviation for those drinking regular coffee is 1.20 cups per day and 1.36 cups per day for those drinking decaffeinated coffee.
No, there is not sufficient information to reject the hypothesis that the proportion of cats and the proportion of dogs that sleep more than 10 hours per day are the same because the test value -0.65 is inside the acceptance region (-1.96,1.96).
Environmental Protection Agency (EPA) fuel economy estimates for automobile models tested recently predicted a mean of 24.80 mpg and a standard deviation of 6.2mpg for highway driving. Assume that a normal model can be applied.
What characteristic (or property of random samples) could be observed during the sampling process?
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