BANA 3363 STUDY QUESTIONS WITH CORRECT ANSWERS
The standard deviation is calculated by: - Answer-taking the squared root of the variance.
Based on a random sample of 50 Ford trucks, statisticians estimated that the average Ford truck on the American roads has a fuel efficiency of somewhere bet...
BANA 3363 STUDY QUESTIONS
WITH CORRECT ANSWERS
The standard deviation is calculated by: - Answer-taking the squared root of the
variance.
Based on a random sample of 50 Ford trucks, statisticians estimated that the average
Ford truck on the American roads has a fuel efficiency of somewhere better 15 & 21
miles per gallon. Assuming the sampling was done correctly, this is a good: - Answer-
interval estimate of the population mean for the efficiency of Ford
When performing a two tail hypothesis test for the population mean when the population
standard deviation is unknown, how do we compute the degrees of freedom for the t-
distribution? - Answer-The degrees of freedom equal the sample size minus 1.
The area under a bell-curve & to the left of the mean represents: - Answer-a probability
of 0.5
To find the interval estimator: - Answer-we add & subtract the margin of error from the
point estimator.
The means of repeated samples taken from a population that is normally distributed: -
Answer-will always be normally distributed.
The larger the population standard deviation, the wider: - Answer-the confidence
interval will be.
Good example of inferential statistics: - Answer-predicting the outcome of an election,
based on polling.
For a fixed sample size, choosing a lower significance level will increase: - Answer-the
probability of making a type II(2) error.
As the sample size increases: - Answer-the standard error of the mean decreases.
Inferential statistics can estimate: - Answer-the population mean, based on the sample
mean.
The standard deviation is a measure describing: - Answer-the variability of data.
If sampling is done correctly, the mean of sampling distribution is: - Answer-always
equal to the population mean.
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