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You need to test the alternative hypothesis that an average is greater than 70. If the population average is 70 and this graph shows the sampling distribution of sample averages, is a sample average of 80 likely to be statistically significant if the significance level is 5%? If so, explain why an average of 80 is likely to reject the null hypothesis. If not, what sample average would be needed to result in a statistically significant result, and why did you choose that value?
as an epidemiologist you are going to investigate the effect of a drug suspected of causing malformations in newborn
A random sample of 25 statistics examinations was taken. The average score in the sample was 76 with a variance of 144. Assuming the scores are normally distributed, the 99% confidence interval for the population average examination score is:
A patient is chosen at random from the clinic. What is the probability that the patient's test comes out positive for Lyme disease?
A normal population has a mean of 75 and a standard deviation of 5. You select a sample of 40. Compute the probability the sample mean is
a population consists of the following five values 13 14 19 21 and 23.a. list all samples of size 3 and compute the
Determine the standard error of estimate. Suppose a large sample is selected (instead of just five). About 68 percent of the predictions would be between what two values?
What would be the correct null and alternative hypothesis for the following situation: The sample has a mean of 72.3 mph and a standard deviation of 7.4 mph. Use a 0.05 significance level to test the claim that the mean speed of all cars is greate..
How many women must be randomly selected to estimate the mean weight of women in one age group. We want 90% confidence that the sample mean is within 3.7 lb of the population mean.
Your specific assignment for this week is to choose a type of quantitative data to gather from your own life. How many minutes does it take yo to get to work everyday.
Assuming both assertions are correcting and assuming normal distributions, which review book is more likely to result in an SAT gain over 60 points?
Find the regression line with all of these states removed from the calculation. Draw this new line on your plot. Was this group of states inuential?
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.
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