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The standard deviation of test scores on a certain achievement test is 11.3. If a random sample of 81 students had a sample mean score of standard deviation of test scores on a certain achievement test is 11.3. If a random sample of 81 students had a sample mean score of 74.6, find a 90 percent confidence interval estimate for the average score of all students.
If probability the first truck is available is= .75, probability the second truck is available is= .50, and probability both are available is= .30, determine the probability which neither truck is available?
Assume then money spent is uniformly distributed between these amounts. Determine the mean amount spent on insurance?
Use this information to compute a 95% confidence interval for average number of credit cards carried by students.
What is the probability of selecting a store at random and finding it has both a pharmacy and a floral shop?
Recognize and describe potential threats (up to 3) to internal validity.
Find out whether this is enough evidence to accept or reject manager's null hypothesis, using alpha = .01. Is this test left-tailed, right-tailed or two-tailed?
What deccision should be made about the null hypothesis, and what decision should be made about the effect of the program.
A certain type of tomato seed germinates 90% of the time. A backyard farmer planted 25 seeds. What is the probability that exactly 20 germinate?
How many Corolla buyers must be surveyed if we want to be 95% confident that the sample percentage is within four percentage points of the true percent all Corolla buyers?
What decision would be made if the researcher used a one-tailed test with an alpha level of .05? (Assume that the herb is expected to increase scores.)
Mr. James McWhinney, president of Daniel-James Financial Services, believes there is a relationship between the number of client contacts and the dollar amount of sales.
Determine the expected shape of distribution of sample mean? Compute the likelihood of choosing a sample with mean of at least $112,000?
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