Jim wishes to estimate the average number of days students are absent from his STA 205 in a semester. In a random sample of 36 of her STA 205 students the mean number of absences was 2.853 days with a standard deviation of 1.878 days. Find the interval that is three standard deviations from the mean. Interpret this interval using either the Empirical Rule or Chebyshev's Rule (whichever is most appropriate for this distribution). Estimate the mean number of days students are absent from Jim's STA 205 using 90% confidence.

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Estimate the mean number of days students are absent from Jims STA 205 using 90% confidence.

4.
Jim wishes to estimate the average number of days students are absent from his STA 205 in a semester. In a
random sample of 36 of her STA 205 students the mean number of absences was 2.853 days with a standard
deviation of 1.878 days.
Find the interval that is three standard deviations from the mean. Interpret this interval using either the
Empirical Rule or Chebyshev's Rule (whichever is most appropriate for this distribution).
Estimate the mean number of days students are absent from Jim's STA 205 using 90% confidence.
Two-tail probability
One-tail probability
0.20
0.10
0.05
0.02
0.01
0.10
0.05
0.025
0.01
0.005
Table T
df
df
30
1.310
1.697
2.042
2.457
2.750
30
32
1.309
1.694
2.037
2.449
2.738
32
35
1.306
1.690
2.030
2.438
2.725
35
1.684
2.021
2.423
2.704
2.690
40
1.303
40
45
1.301
1.679
2.014
2.412
45
Transcribed Image Text:4. Jim wishes to estimate the average number of days students are absent from his STA 205 in a semester. In a random sample of 36 of her STA 205 students the mean number of absences was 2.853 days with a standard deviation of 1.878 days. Find the interval that is three standard deviations from the mean. Interpret this interval using either the Empirical Rule or Chebyshev's Rule (whichever is most appropriate for this distribution). Estimate the mean number of days students are absent from Jim's STA 205 using 90% confidence. Two-tail probability One-tail probability 0.20 0.10 0.05 0.02 0.01 0.10 0.05 0.025 0.01 0.005 Table T df df 30 1.310 1.697 2.042 2.457 2.750 30 32 1.309 1.694 2.037 2.449 2.738 32 35 1.306 1.690 2.030 2.438 2.725 35 1.684 2.021 2.423 2.704 2.690 40 1.303 40 45 1.301 1.679 2.014 2.412 45
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