A particular product had been used for about one-third of its expected lifetimes. The failure times (in years) for the 47 product sample is described. below. Locate a 95% confidence interval for the true mean failure time of the used product. Enter the upper and lower bound for the confidence interval.

If the mean failure time (in years) is less than 3.75 years, the manufacturing process needs a company-wide overhaul. Do we need an overhaul? Report p-value.

If the mean failure time (in years) is less than 3.75 years, the manufacturing process needs a company-wide overhaul. Do we need an overhaul? Make a decision with alpha = 0.05.

If the mean failure time (in years) is less than 3.75 years, the manufacturing process needs a company-wide overhaul. Do we need an overhaul? Make a decision with alpha = 0.001

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4.66

3.07

4.73

4.67

3.81

1.86

2.47

3.11

3.39

5.8

4.16

2.6

2.25

3.11

3.1

2.99

3.65

2.51

3.84

2.16

3.18

3.78

3.53

4.2

3.34

3.9

4.49

2.71

2.12

3.45

3.16

2.86

2.97

2.75

4.13

4.55

4.39

2.97

4.64

3.12

5.16

3.96

2.95

2.57

2.23

2.33

1.84