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Test scores have a stadard deviation of 18 and a mean of 69. if at random, 49 test scores are picked what is the probability than the mean score is less than 62?
0.0050
0.0033
0.9967
0.3859
Test scores have a mean of 69 and a standard deviation of 18. If 49 test scores are randomly selected, find the probability the mean score is greater than 75?
0.9901
0.0099
0.5999
0.3707
Emergency room wait times have a mean of 25.2 minutes and a standard deviation of 15.7 minutes. If 36 wait times are randomly selected, find the probability the mean wait time is between 22 and 28 minutes?
0.0336
0.9644
0.3783
0.6217
Emergency room wait times have a mean of 25.2 minutes and a standard deviation of 15.7 minutes. If 36 wait times are randomly selected, find the probability the mean wait time is greater than 30 minutes?
0.9664
400 people are chosen from a large population that is 50% women. How likely is it that the sample has only 180 women or fewer? What is the value of the test statistic z?
Suppose that a random sample of 14 cars shows an average speed of 24.0 mph, with a sample standard deviation of 2.2 mph. Assume that the speeds of cars are normally distributed. Using the T-table, what is the p-value?
Keith's florist has 18 delivery trucks used mainly to deliver flowers in the SC area. Of these 18 trucks, 5 have brake problems. A sample of 4 trucks is randomly selected. What is the probability that 2 of those defective have defective braked. Ro..
you are picking a bouquet of 20 flowers for your mother at random from a garden with 25 coneflowers 35 daisies and 42
Based on this sample information, create a 90% confidence interval for population mean yearly premium.
The calculated value of F in a one-way analysis is 8.23. The numerator degrees of freedom and denominator degrees of freedom are 4 and 8, respectively.
The researcher estimated that out of the 100 students at least 50% of the students would be exposed to movies and TV w/ crude humor at least 2-4 times per week.
How to calculate expected difference between the samples means, and how does larger variability affect the size of the standard error for the sample mean difference?
Use the Excel COUNTIF function to determine the number of tires that last longer than 40,000 miles. What is your estimate of the percentage of tires that will exceed 40,000 miles?
Using your knowledge of infectious disease epidemiology, quantify the pattern of disease X in this group, i.e., what are the infectivity, pathogenicity, and virulence of disease X?
To avoid losing money, the top 5% (the heaviest 5%) is labeled overweight. A) What proportion of boxes is underweight?
suppose we have a population of scores with a mean micro of 975 and a standard deviation s of 15. assume that the
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