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The population of IQ scores forms a normal distribution with a mean of µ = 100 and a standard deviation of o = 15.what is the probability of obtaining a sample mean greater than M=97
a) for a random sample of n=9 people
b)for a random sample of n=25 people
Test hypothesis that intake of linoleic acid in this group is lower than that of general population. Also, calculate p-value for hypothesis test.
A recent study of 50 self-service gasoline stations in the Greater Cincinnati' Northern Kentucky metropolitan area revealed that the mean price of unleaded gas was $2.029 per gallon. The sample standard deviation was $0.03 per gallon.
In order to conduct testing of the life hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6). 378, 361, 350, 375, 200, 391, 375, 368, 321 What is the variance?
Assuming that the two job offers are independent of each other, what is the probability that the applicant gets an offer from both companies?
Assuming that a hypothesis test of the claim has been conducted and that the conclusion is failure to reject the null hypothesis, state the conclusion in nontechnical terms.
f x has a normal distribution with mean µ=15 and standard deviation σ= 3, describe the distribution of x values for sample size n, where n = 4, n = 16, and n = 100. How do the x distributions compare for the various sample sizes?
Pproportion who are sent to prison after pleading innocent and being found guilty? No, as the test value -1.96 is inside interval (-2.58, 2.58), No, as the test value -4.94 is outside interval (-1.96, 1.96).
A machine cuts circular filters from large rolls of material. If 7.3% of the filters fail to meet specifications, use the normal approximation to the binomial to compute the probability
a test has a mean of 104 and a standard deviation of 16. we want to be 98 certain that we are within 4 points of the
Explain the difference between testing a single mean and testing the difference between two means. What two assumptions must be met when one is using z test to test differences between two means?
A behavioral research situation that could use a Pearson coefficient research study and a chi square research study. Present the rationale for each selection.
Find the weighted mean if each three-hour course counts for 18%, and each four-hour course counts for 23% of her final semester score.
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