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5) We ask whether a new version of a textbook impacts students learning of statistics. On...

5) We ask whether a new version of a textbook impacts students learning of statistics. On a national statistic exam students using the old textbook score 68.5. A sample of students using the new textbook have the following scores:

64           69           92           77           71    82           74           69           88

a) What is the sample mean?

5b) What is the sample standard deviation?

5c) What is H0 and H1 for this study?

5d) Compute tobt

5d) Compute tobt

5f) What do you conclude about the use of this book (α=0.05)?

It is not signfiicantly from the old book

It is significantly different from the old book

5g) Compute Cohen d.

7) A researcher predicts that smoking cigarettes decreases a person’s sense of smell. On a test of olfactory sensitivity, the μ for nonsmokers is 18.4. A sample of non-smokers decided to smoke a pack a day to see how it impacts their olfactory sense and produces these scores:   16        14        19        17        16        18   

a) What is the sample mean?

7b) What is the sample standard deviation?

c) What is H0 and H1 for this study?

H0: μ=18.4; H1: μ≠18.4

H0: μ≠18.4; H1: μ=18.4

H0: μ>18.4; H1: μ<18.4

H0: μ<18.4; H1: μ>18.4

7d) Compute tobt

7e) With α=0.05, what is the negative value of tcrit?

7f) What do you conclude about the sense of smell (α=0.05)?

math   Statistics-And-Probability   
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