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? b) What is the sample standard deviation? c) What is H0 and H1 for this study? a H0: μ=18.4; H1: μ≠18.4 b H0: μ≠18.4; H1: μ=18.4 c H0: μ>18.4; H1: μ<18.4 d H0: μ<18.4; H1: μ>18.4 d) Compute tobt e) With α=0.05, what is the negative value of tcrit? f) What do you conclude about the sense of smell (α=0.05)? a Smokers sense of smell is significantly greater than or equal to non-smoker b Smokers sense of smell is significantly less than non-smoker
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?
b) What is the sample standard deviation?
c) What is H0 and H1 for this study?
| a |
H0: μ=18.4; H1: μ≠18.4
|
|
| b |
H0: μ≠18.4; H1: μ=18.4
|
|
| c |
H0: μ>18.4; H1: μ<18.4
|
|
| d |
H0: μ<18.4; H1: μ>18.4
|
d) Compute tobt
e) With α=0.05, what is the negative value of tcrit?
f) What do you conclude about the sense of smell (α=0.05)?
| a |
Smokers sense of smell is significantly greater than or equal to non-smoker
|
|
| b |
Smokers sense of smell is significantly less than non-smoker
|
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 2 images
