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Why do we do power calculations with single sample z test?
A) Because we can use Z area tables to calculate the power.
B) Because comparing a sample mean against a population mean is very powerful
C) Three of the other answers
D) Two of the other answers
E) If the standard deviation had to be estimated from the sample, the calculations would involve t distributions, which vary by sample size.
Create a 95% confidence interval for the population mean days absent for sickness based on this sample. Select the answer closest to your results.
Using smoothing constant of w = .80, compute the value of exponentially smoothed series in 1983.
At the .05 significance level, is the number of units produced on the afternoon shift larger?
Determine the probability that gas tank's capacity is above 15.25 gallons?
Computing relative frequencies in a contingency table and a survey of a sample of 347 people is conducted. The survey's respondents are classified according to their political affiliation and their opinion on a bill.
In a group of six professors selected at random, what is the expected number of extroverts? What is the standard deviation of the distribution?
Each vehicle had the gallon of gas added to the empty tank and then driven until empty. Number of miles travelled for all twelve readings are below. Use data to compute the mean and median mileages.
A major benefit of two-way ANOVA over several one-way ANOVAs, If an F test for interaction is significant.
For a normal population with u. = 80 and a = 20 which of the following samples is least likely to be obtained?
Assume that a study of 500 randomly selected school bus routes showed that 480 arrived on time. Is it "significant" for a school bus to arrive late?
What is probability of selecting 2 families neither had taxes prepared by H&R Block?
The researchers planned to use simple linear regression to see if the age at which a baby was first able to crawl could be predicted from the average outdoor temperature six months after each baby's birthdate.
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