In a test for acid rain, a random sample of 49 water samples showed a mean pH level of 4.4 with a standard deviation of 0.35. Find a 90% confidence interval estimate for the mean pH level. a. O b. O C. O d. 4.4 ± 1.677 (0.35) √49 4.41.645 4.4 1.677 4.4 ± 1.645 (0.35)(0.65) 500 (0.35)(0.65) 500 0.35

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In a test for acid rain, a random sample of 49 water samples showed a mean pH level of 4.4 with a standard deviation of 0.35. Find a 90%
confidence interval estimate for the mean pH level.
O a.
O b.
O C.
O d.
O e.
0.35
4.4 ± 1.677 (0,25)
49
4.4 +1.645
4.4 + 1.677
(0.35)(0.65)
500
4.41.645
(0.35) (0.65)
500
4.4 ± 1.645 (0:35)
49
0.35
49-1
Transcribed Image Text:In a test for acid rain, a random sample of 49 water samples showed a mean pH level of 4.4 with a standard deviation of 0.35. Find a 90% confidence interval estimate for the mean pH level. O a. O b. O C. O d. O e. 0.35 4.4 ± 1.677 (0,25) 49 4.4 +1.645 4.4 + 1.677 (0.35)(0.65) 500 4.41.645 (0.35) (0.65) 500 4.4 ± 1.645 (0:35) 49 0.35 49-1
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