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Why do we modify the formula for calculating standard deviation when using t tests (and divide by N - 1)?
Discuss why the standard error for the distribution of sample means is smaller than the standard deviation of sample scores.
Distinguish between within-group designs and between-group designs.
How is a t critical value affected by sample size and degrees of freedom?
Explain what each part of the following statistic means, as it would be reported in the American Psychological Association (APA) format: t(4) = 2.87, p = 0.032.
When do we use a paired-samples t test?
Find the average age at which people will experience their first cardiac incident, given that 17% of all initial cardiac incident victims are younger than 50. Please, interpret the result.
When creating a 99% confidence interval for the true average difference in cholesterol levels by the drug, what is the margin of error?
Illustrate what can we say about the probability distribution. Is it approximately normal, elucidate the mean and standard deviation.
Determine the number of successes suggested by the given statement.
What is the probability that more than one machine is in the system? Probability that more than two are broken and waiting to be repaired or being serviced? More than three? More than four?
Let 3 trails (they may not be independent), each of which is either success or not. Let X denotes number of successes. Assume E[X] = 1.8. Determine the largest possible value of P(X=3)?
University of Waterloo are much susceptible to hypnosis which University of Tennessee undergraduates. Set up H0 and Ha for the test.
Would the method described above be a good way to determine which team was taller (explain why or why not)?
In determining automobile mileage ratings, it was found that the mpg in the city (x) for a certain model is normally distributed, with a mean of 24 mpg and a standard deviation of 1.0 mpg. Find the following:
Do you think that all random samples taken from the same population will lead to the same result?
Survey on What do you think is the biggest problem facing education today. One problem with exit polls may be that the wrong "key precincts" were chosen.
A test was conducted to find out whether gender of a spokesperson affected the likelihood that consumers would prefer a new product. A survey of consumers at trade show employing a female spokesperson determined that 70 out of 150 customers prefe..
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