Question

1. (CO6) From a random sample of 68 businesses, it is found that the mean time that employees spend on personal issues each week is 4.9 hours with a standard deviation of 0.35 hours. What is the 95% confidence interval for the amount of time spent on personal issues?

(4.55, 5.25)

(4.82, 4.98)

(4.71, 5.09)

(4.83, 4.97)

2.

(CO6) Which of the following is most likely to lead to a small margin of error?

small mean

large sample size

small standard deviation

large maximum error

3.

(CO6) A company making refrigerators strives for the internal temperature to have a mean of 37.5 degrees with a standard deviation of 0.6 degrees, based on samples of 100. A sample of 100 refrigerators have an average temperature of 37.53 degrees. Are the refrigerators within the 90% confidence interval?

No, the temperature is outside the confidence interval of (36.90, 38.10)

Yes, the temperature is within the confidence interval of (37.40, 37.60)

No, the temperature is outside the confidence interval of (37.40, 37.60)

Yes, the temperature is within the confidence interval of (36.90, 38.10)

4.  

(CO6) What is the 97% confidence interval for a sample of 104 soda cans that have a mean amount of 15.10 ounces and a standard deviation of 0.08 ounces?

(15.083, 15.117)

(15.020, 15.180)

(12.033, 12.067)

(15.940, 15.260)

Answer 1

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Since the confidence interval includes  37.53.

Yes, the temperature is within the confidence interval of (37.40, 37.60)

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