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You are provided with the heights of male and female participants:
Male Female 64.00 67.00 72.00 62.00 71.00 61.00 71.00 61.00 69.00 65.00 67.00 64.00 69.00 63.00 75.00 64.00
Using the above database, compute a t-test comparing males' and females' heights. You must determine which type of t-test to compute. Write a short interpretation of the results.
A food snack manufacturer samples 13 bags of pretzels off the assembly line and weighs their contents. If the sample mean is 14.7 oz. and the sample standard deviation is 0.50 oz., find the 95% confidence interval of the true mean.
Construct a 95% confidence interval for the population mean, assuming a normal distribution?
First-order regression model was fit to data. Part of printout follows?
Estimate with 90% confidence the difference in the level of satisfaction with service between the two branches.
Find the probability that in a given month:
A film alliance used a random sample of 50 U.S. citizens to estimate that the typical American spent 78 hours watching videos and DVDs last year. The standard deviation of this sample was 9 hours.
If you randomly assign participants to groups, can you suppose the groups are equivalent at the beginning of the study?
The times needed to fall asleep are assumed to follow a normal distribution. The results for the two nights for the ten volunteers are shown below:
At the 0.05 level of significance, can we conclude Middletown students remained in their districts less time than Brockton students? Make use of 5-step hypothesis testing procedure.
If we wanted to shorten the interval of the estimation of the true mean of Saturday sales to a width of $600 in total, what should the size of our sample be to achieve it?
A computer is used and it is found that the P-value = 0.0016. What can you state about the sample (independent or dependent) and what can you conclude about the evidence?
At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. Is this a 1 or 2 tail test?
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