The standard deviation for a population is o = 15.2. A sample of 25 observations selected from this population gave a mean equal to 143.55. The population is known to have a normal distribution. Round your answers to two decimal places. a. Make a 99% confidence interval for u. (i b. Construct a 95% confidence interval for u. c. Determine a 90% confidence interval for u. d. Does the width of the confidence intervals constructed in parts a through c decrease as the confidence level decreases?

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The standard deviation for a population is o = 15.2. A sample of 25 observations selected from this population gave a mean equal
to 143.55. The population is known to have a normal distribution.
Round your answers to two decimal places.
a. Make a 99% confidence interval for u.
i
i
b. Construct a 95% confidence interval for u.
(i
i
c. Determine a 90% confidence interval for u.
i
i
d. Does the width of the confidence intervals constructed in parts a through c decrease as the confidence level decreases?
Transcribed Image Text:The standard deviation for a population is o = 15.2. A sample of 25 observations selected from this population gave a mean equal to 143.55. The population is known to have a normal distribution. Round your answers to two decimal places. a. Make a 99% confidence interval for u. i i b. Construct a 95% confidence interval for u. (i i c. Determine a 90% confidence interval for u. i i d. Does the width of the confidence intervals constructed in parts a through c decrease as the confidence level decreases?
The standard deviation for a population is o = 7.25. A random sample selected from this population gave a mean equa
Make a 95% confidence interval for µ assuming n = 49.
Round your answers to two decimal places.
i
to
i
Transcribed Image Text:The standard deviation for a population is o = 7.25. A random sample selected from this population gave a mean equa Make a 95% confidence interval for µ assuming n = 49. Round your answers to two decimal places. i to i
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