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Mathematics, 28.08.2019 16:00 mokunola16
Putting the tiles in order;
a university is conducting a survey to study the number of hours students sleep at night during exam week. a sample of 20 students was drawn, and these responses were obtained: 6.5, 5, 8, 5.5, 7, 4, 4.5, 5, 6, 5.5, 4, 7.5, 6, 7, 8, 5, 6, 6.5, 6.5, 5. the standard deviation of the population mean is 2 hours.
arrange the steps in the correct sequence to find the range in which 95% of the sample mean occurs.
tiles are:
1. the range in which 95% of the sample mean occurs
= 5.93 + 2 × 0.45 and 5.93 − 2 × 0.45
= 6.83 hours and 5.03 hours.
2. the sample mean is /u = 118.5/20=5.93
3. calculate the standard deviation.
4. the 20 students' total number of study hours
is 118.5 hours.
5. the standard error of the mean of the sample is sigma/sqrt n = 2/sqrt 20 = 0.45
6. the range in which 95% of the sample mean occurs is /u +- 2 x sigma/ sqrt n.
only need 5 steps
.
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Putting the tiles in order;
a university is conducting a survey to study the number of hours...
a university is conducting a survey to study the number of hours...
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