Mathematics, 06.03.2020 23:51, shardonnay2160
Some researchers are interested in the GPA difference between freshmen and sophomores. The distributionsof GPAs in both groups are approximately normal. From previous school records, we know that themean and standard deviation for freshmen are 3.5 and 0.5, respectively. Similarly, the mean and standarddeviation for sophomores are 3.2 and 0.8, respectively. Independent random samples of 40 students areto be selected from both years (for a total of 80 students).
a. If the sample mean GPA is to be calculated for both groups and we calculate the diļ¬erence between freshmen and sophomores, what is the expected value for the diļ¬erence in sample means?
b. If the sample mean GPA is to be calculated for both groups and we calculate the diļ¬erence between freshmen and sophomores, what is the standard deviation of the sampling distribution of the diļ¬erence in sample means?
c. What is the probability that the average GPA in freshmen is higher than the average GPA in the sample of sophomores?
Answers: 3
Mathematics, 21.06.2019 17:30, kaliebeckp8vqrs
11. a particular type of cell doubles in number every hour. which function can be used to find the number of cells present at the end of h hours if there are initially 4 of these cells? a. n = 4 ()" b. n = 4(2)" c. n = 4 + (2)" din = 4 +"
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Mathematics, 22.06.2019 04:30, bigmouth804
An angle bisector ac divides a trapezoid abcd into two similar triangles ? abc and ? acd. find the perimeter of this trapezoid if the leg ab=9 cm and the leg cd=12 cm.
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Some researchers are interested in the GPA difference between freshmen and sophomores. The distribut...
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