Question 11

In a sample of 15 stuffed animals, you find that they weigh an average of 8.56 ounces with a standard deviation of 0.09 ounces. Find the 92% confidence interval.

A)(8.528, 8.591)

B)(8.516, 8.604)

C)(8.526, 8.594)

D)(8.510, 8.610)

Question 12

Market research indicates that a new product has the potential to make the company an additional $3.8 million, with a standard deviation of $1.6 million. If this estimate was based on a sample of 10 customers, what would be the 90% confidence interval?

A)(2.87, 4.73)

B)(2.70, 4.90)

C)(2.51, 5.09)

D)(2.81, 4.79)

Question 13

Supplier claims that they are 95% confident that their products will be in the interval of 20.45 to 21.05. You take samples and find that the 95% confidence interval of what they are sending is 20.32 to 21.48. What conclusion can be made?

A)The supplier products have a lower mean than claimed

B)The supplier is more accurate than they claimed

C)The supplier is less accurate than they have claimed

D)The supplier products have a higher mean than claimed

Question 14

In a sample of 19 small candles, the weight is found to be 3.72 ounces with a standard deviation of 0.963 ounces. What would be the 87% confidence interval for the size of the candles?

A)(3.199, 4.241)

B)(3.371, 4.069)

C)(3.369, 4.071)

D)(3.337, 4.103)

Question 15

In a situation where the standard deviation was increased from 3.1 to 5.8, what would be the impact on the confidence interval?

A)It would become wider due to the increased standard deviation

B)It would remain the same as standard deviation does not impact confidence intervals

C)It would become narrower with more values

D)It would become narrower due to the increased standard deviation