Question # 2- Please solve using Minitab 17 Researchers studying infant head circumference

| November 18, 2015

Question # 2- Please solve using Minitab 17

Researchers studying infant head circumferences (in centimeters) wish to test if the mean head circumference differs from the historical mean of 34.5 cm. The researchers obtain a sample of 17 infants with a mean head circumference of 34.16 cm and a standard deviation of 0.58 cm.

At the α = 0.05 significance level, test the claim

HO: µ = 34.5

HA: µ ≠ 34.5

1. a) Is this an upper tail, lower tail, or two-tail test? (5 points)
2. b) Are we testing means or proportions? (5 points)
3. c) State the rule of rejection (in terms of p-value and level of significance) (5 points)
4. d) Find the p-value (5 points)
5. e) Should you reject or not reject HO? (5 points)
6. f) Does the result suggest that the mean head circumference differs from 34.5 cm? (5 points)

Question # 3 Please solve using Minitab 17

The below sample data represents the cost of 9 name-brand drugs and their corresponding genericequivalent. (Use Name Brand as Sample1)

 Name Brand 120 150 135 140 160 175 140 120 165 Generic Brand 99 135 130 119 139 150 129 109 160

1. a) Compute a two-sided 90% confidence Interval estimate for µd. (5 points)

1. b) Based on your interval, can you safely conclude that generics are less expensive than name brand? Why or why not? (5 points)

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