aliyah Sorm: Attempt 1 Question 1 (1 point) A random sample of 35 trading days i

Question

aliyah Sorm: Attempt 1 Question 1 (1 point) A random sample of 35 trading days is taken and the volume of a particular stock is recorded. The sample resulted in a mean trading volume of 39.48. Assuming a population standard deviation of 15.07, calculate a 95% confidence interval for using a Z interval. a) (38.64, 40.32) b) Cannot be computed because the Z interval does not apply. c) (35.29,43.67) d) (34.49,44.47) Save Question 2 (1 point) Compute E, the margin of error for the t interval, for a 90% confidence interval for ? if a

Explanation / Answer

Given : x' = 39.48

s = 15.07 / ?35 = 2.5473

z for 95% = 1.96

LCL = x' - zs

= 39.48 - 1.96 * 2.5473

= 34.4873

UCL = x' + zs

= 39.48 + 1.96 * 2.5473

= 44.4727

The confidence interval is (34.49, 44.47).

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