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A sample of Alzheimer's patients is tested to assess the amount of time in stage IV sleep. The number of minutes spent is Stage IV sleep is recorded for a random sample of 61 Alzheimer's patients. The sample produced a mean of 48 minutes of stage IV sleep with a standard deviation of 14 minutes. Compute and interpret a 95 percent confidence interval for this data.
Suppose a organization takes a random sample of 1000 voters and ask them whether they approve of the job performance of the president. What sampling distribution is related to thin process.
Give the estimate of mean and variance of population distribution of weekly wintertime Breckenridge snowfall using sample.
During the last year sales averaged $22,000 per month. Does this indicate that monthly sales have changed (in a statistically significant sense)? Use 0.05. Assume monthly sales are normally distributed.
With 95% confidence, what is the margin of error (to 2 decimals)? What is the 95% confidence interval estimate of the population mean?
Final scores averaged 66 for the treatment group; the SD was 21. For the control group, the figures were 59 and 20. What do you conclude?
how would you go about selecting a particular level of significance icircplusmn to conduct a hypothesis test? provide
Generate the statistical null and alternative hypotheses. Describe what information the effect size would tell you that the probability value would not tell you.
At the .05 significance level, is there a difference in gas mileage for the different types of gas? Write out your null and alternative hypotheses for the problem and state what the finding means practically.
Additionally, method of delivery of drug (patch,pill, or nasal mist) was considered. In experiment, there were how many treatments?
Suppose there are two samples of size 6 and 7, with a rank sum of 58 in the sample of size 6. Using the Wilcoxon rank sum test, evaluate the significance of the results, assuming there are no ties.
The ACT is also distributed with meanof 21 and standard deviation of 4.7. Rachel wants to be in the 98th percentile on each test. What scores must she recieve on each exam?
Determine regression line for predicting January temperature from latitude.
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