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Do women talk more than men? Equip male and female students with a small device that secretly records sound for arandom 30 seconds during each 12.5 minute interval for two days. Count the words each subject speaks during each recording period, and from this, estimate how many words per day each subject speaks. The published report includes a table summarizing six such studies. Her are two of the six:
Study 1; Sample size: Women - 56 Men - 56 Estimated average number (SD) of words spoken per day; Women: 16,177 (7520) Men: 16,569 (9108)
Study 2;sample size: Women - 27 Men - 20 Estimated average number (SD) of words spoken per day; Women: 16,496 (7914) Men: 12,867 (8343)
In standard normal distribution standard deviation is always ___.
Based on this data, give a 95% confidence interval for the average MAO activity level of bulimic patients. Assume that the level of MAO activity is normally distributed.
Draw a tree diagram representing this experiment. Use this tree diagram to find the probabilities below.
The forecast for the third quarter is 3,000 units; the seasonal index for the quarter is 1.05. What are the seasonally adjusted sales for the quarter?
A researcher wants to determine a 95% confidence interval for the mean number of hours that UMKC students spend doing homework per week.
The mean difference in total cholesterol levels (after - before) was 27.138 mg/dL with a standard deviation of 7.3685 mg/dL. Create a 95% confidence interval for the true average difference in cholesterol levels by the drug.
Which of the following measures only the strength of a relationship?
Do you think the Poisson distribution, which assumes independent arrivals, is a good estimation of arrival rates in the following queuing systems? Defend your position in each case.
What is the value of the test statistic? (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
The sat scores attainted by the students in nyc are approximately normally distributed with a mean of 500 and a standard deviation of 80. Find the percentage of students who score less than 700.
Identify a business situation where you might want to make an estimate. For example, you might want to estimate the mean dollar amount spent by customers at a retail store.
Find historical information on the statisticians who developed statistical tests, such as the normal distribution, Student t distribution, Chi-Square distribution
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