(CO 4) From a random sample of 55 businesses, it is found that the mean time that employees spend on personal issues each week is 5.8 hours with a standard deviation of 0.35 hours. What is the 95% confidence interval for the amount of time spent on personal issues?

Group of answer choices

(5.73, 5.87)

(5.72, 5.88)

(5.71, 5.89)

(5.74, 5.90)

Flag question: Question 2

Question 2

2pts

(CO 4) If a confidence interval is given from 8.54 to 10.21 and the mean is known to be 9.375, what is the maximum error?

Group of answer choices

0.835

1.670

8.540

0.418

Flag question: Question 3

Question 3

2pts

(CO 4) If the population standard deviation of a sample decreases without other changes, what is most likely to happen to the confidence interval?

Group of answer choices

widens

narrows

does not change

cannot determine

Flag question: Question 4

Question 4

2pts

(CO 4) From a random sample of 41 teens, it is found that on average they spend 43.1 hours each week online with a population standard deviation of 5.91 hours. What is the 90% confidence interval for the amount of time they spend online each week?

Group of answer choices

(40.58, 45.62)

(41.58, 44.62)

(31.28, 54.92)

(37.19, 49.01)

Flag question: Question 5

Question 5

2pts

(CO 4) 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 37.70 degrees. Are the refrigerators within the 90% confidence interval?

Group of answer choices

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

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

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

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

Flag question: Question 6

Question 6

2pts

(CO 4) What is the 97% confidence interval for a sample of 104 soda cans that have a mean amount of 15.10 ounces and a population standard deviation of 0.08 ounces?

Group of answer choices

(15.083, 15.117)

(15.020, 15.180)

(12.033, 12.067)

(15.940, 15.260)

Flag question: Question 7

Question 7

2pts

(CO 4) Determine the minimum sample size required when you want to be 98% confident that the sample mean is within two units of the population mean. Assume a standard deviation of 7.55 in a normally distributed population.

Group of answer choices

76

78

77

44

Flag question: Question 8

Question 8

2pts

(CO 4) Determine the minimum sample size required when you want to be 80% confident that the sample mean is within 1.3 units of the population mean. Assume a standard deviation of 9.24 in a normally distributed population.

Group of answer choices

194

195

84

83

Flag question: Question 9

Question 9

2pts

(CO 4) Determine the minimum sample size required when you want to be 75% confident that the sample mean is within fifteen units of the population mean. Assume a standard deviation of 327.8 in a normally distributed population

Group of answer choices

1835

1293

785

632

Flag question: Question 10

Question 10

2pts

(CO 4) In a sample of 8 high school students, they spent an average of 24.8 hours each week doing sports with a standard deviation of 3.2 hours. Find the 95% confidence interval.

Group of answer choices

(24.10, 25.50)

(22.66, 26.94)

(22.12, 27.48)

(21.60, 28.00)

Flag question: Question 11

Question 11

2pts

(CO 4) In a sample of 15 stuffed animals, you find that they weigh an average of 8.56 ounces with a standard deviation of 0.08 ounces. Find the 92% confidence interval.

Group of answer choices

(8.528, 8.591)

(8.543, 8.577)

(8.521, 8.599)

(8.516, 8.604)

Flag question: Question 12

Question 12

2pts

(CO 4) Market research indicates that a new product has the potential to make the company an additional $3.8 million, with a standard deviation of $1.9 million. If this estimate was based on a sample of 10 customers, what would be the 90% confidence interval?

Group of answer choices

(2.51, 5.09)

(2.70, 4.90)

(2.00, 5.60)

(1.90, 5.71)

Flag question: Question 13

Question 13

2pts

(CO 4) 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?

Group of answer choices

The supplier products have a lower mean than claimed

The supplier is less accurate than they have claimed

The supplier is more accurate than they claimed

The supplier products have a higher mean than claimed

Flag question: Question 14

Question 14

2pts

(CO 4) In a sample of 18 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?

Group of answer choices

(3.320, 4.120)

(3.359, 4.081)

(3.337, 4.103)

(3.371, 4.069)

Flag question: Question 15

Question 15

2pts

(CO 4) In a situation where the standard deviation was increased from 3.1 to 5.8, what would be the impact on the confidence interval?

Group of answer choices

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

It would become wider due to the increased standard deviation

It would become narrower with more values

It would become narrower due to the increased standard deviation

Flag question: Question 16

Question 16

2pts

(CO 4) In a random sample of eighteen people, the mean time at lunch was 35.6 minutes with a standard deviation of 8.2 minutes.Assuming the data are normally distributed, what would be the 85% confidence interval?

Group of answer choices

(32.82, 38.38)

(33.02, 38.18)

(33.12, 38.08)

(32.69, 38.51)

Flag question: Question 17

Question 17

2pts

(CO 4) If a confidence interval is known to be (43.83, 46.37), what would be its margin of error?

Group of answer choices

2.54

0.64

1.27

3.54

Flag question: Question 18

Question 18

2pts

(CO 4) A company manufacturers soda cans with a diameter of 52 millimeters.In a sample of 22 cans, the standard deviation was 2.3 millimeters.What would be the 96% confidence interval for these cans?

Group of answer choices

(50.39, 50.70)

(50.93, 53.07)

(50.99, 53.01)

(50.55, 53.02)