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Calculating the effectiveness of an educational intervention using a pretest-posttest design. I plan to run an ANCOVA on the scores with the pretest as the covariate. The six subcatagories on the test give the raw score of correct answers out of the total possible on each subcatagories. The overall score is given as a scaled score to equalize any differences on the pretest and posttest versions. The number of questions in each subcatagory and the overall test vary from the pretest and the posttest. Do I need to convert the scores to z scores to run the ANCOVA or can I use a percent score for each subcatagory and the scaled score for the overall score?
The amount of time a bank teller spends with each customer has a population mean = 3.1 minutes and population standard deviation = 0.4 minute.
While 290 out of 400 in Batavia preferred the same flavor. To test the hypothesis that there was no difference in preferences in the two towns, what is the alternate hypothesis?
One prominent physician claims that 70% of chose with lung cancer are heavy smokers. If his assertion is correct. find the probability that more than half are heavy smokers.
What is the probability that this process will be stopped within the next hour and what is the variance of the number of defectives in a batch of 15 ?
What can we say about the form or way of the distribution of the average or median of the sample?
The p-value for a test statistic is .085, what is the minimum level of significance required to reject the null hypothesis?
What is the 95% confidence interval for the standard deviation of birth weights at County General Hospital, if the standard deviation of the last 25 babies born there was 1.1 pounds.
What is the probability that sara will die in her 60th year? using this probability and the $50,000 death benefits, what is the expected loss?
A sample of 81 observations is selected from a normal population with a standard deviation of 5. The sample mean is 40. Determine the 95% confidence interval for the population mean.
Sample of size 26 was taken from normal population with standard deviation 1.697. Approximate the probability that standard deviation of sample is greater than 1.23.
The population standard deviation was 1.68 years. Using the 99% degree of confidence, what is the confidence interval for the population mean.
For sample of size 100, what is the mean and standard deviation of the sample mean.
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