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A random sample of size 15 is selected from a normal population. The population standard deviation is unknown. Assume that a two-tailed test at the 0.10 significance level is to be used. For what value of t will the null hypothesis not be rejected?
would this prove that they are exceeding their goal, using α = .025?
Based on surveys conducted in 1989 and 1999, a researcher compared the proportion of high school age females interested in a career in science in 1989 with the proportion in 1999. He concluded that the proportions were not significantly different ..
A survey of the residents of a new subdivision on why they happened to select that area in which to live. You also wish to secure some information about what they like and do not like about life in the subdivision.
What is the P-value of the test, assume the standard deviation is 3 years, a 95% confidence interval for the average time
How many commercials' worth of data do I need to have a margin of error no more than 3, the correct set of hypotheses
A company is interested in estimating μ, mean number of days of sick leave taken by its employees. The firm's statistician randomly selects 100 personnel files and notes the number of sick days taken by each employee.
Examine the behaviour of 99% critical values for these degrees of freedom, and comment on the limits in this case.
A bond analyst is analyzing interest rates for corresponding municipal bonds issued by two different states. At α = .05, is there a difference in interest rates paid by two states?
A coin is flipped e times and heads (h) or tails (t) are recorded:
Convert each of the following z intervals to x intervals.
Interpret coefficient on log (salesm). If salesm were to be increased by 20%, what would be estimated change in mktgp? Would this effect be substantive?
Create raw score predictions on criterion variable for persons with Z scores on predictor value of -2,-1,0,+1,+2.
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