Question
In: Statistics and Probability
A researcher is interested in studying how smoking affects air pollution in rooms. Air pollution is...
A researcher is interested in studying how smoking affects air pollution in rooms. Air pollution is measured as the amount of suspended particulate matter. A random sample of 14 rooms in homes where there is no smokers, and a random sample of 22 rooms in homes where there is a smoker were selected. Assume that all necessary normality assumptions are met. Below are some summaries:
| mean | standard deviation | |
| sample without smokers | 5.2 | 2.3 |
| sample with smokers | 6.7 | 4.4 |
| sample of differences | -1.5 | 6.1 |
The researcher wants to test whether the difference in the average air pollution between rooms without and with smokers exceeds 2. Show all steps of the testing procedure.
Solutions
Expert Solution
Let 
denote the average air pollution in rooms without smokers and with
smokers respectively.
Conclusion in problem context :
There is sufficient evidence to support the claim that the difference in the average air pollution between rooms without and with smokers exceeds 2
orchestra answered 1 year agoRelated Solutions
A researcher is interested in studying whether a new stretching technique affects the time needed to...
A researcher is interested in studying whether a new stretching
technique affects the time needed to complete a certain running
exercise. The times of 4 randomly selected participants were
measured before the new stretching technique was used, and then the
times for the same participants were measures after the new
technique was used. The resulting data is
before new technique
58
70
61
63
after new technique
65
53
58
52
Is there a significant difference between the mean times...
A researcher is studying how the fear of going to the dentist affects an adult's actual...
A researcher is studying how the fear of going to the dentist
affects an adult's actual number of visits to the dentist. She asks
a random sample of adults whether or not they fear going to the
dentist and also how many times they have gone in the past 10
years. She would like to assess if the average number of visits
made by adults who fear going to the dentist (Group 1) is higher
than the average number of...
A researcher is interested in determining whether the illumination level in a room affects how quickly...
A researcher is
interested in determining whether the illumination level in a room
affects how quickly clients can be put into a trance. The time (in
seconds) it took for five clients to go into a trance when it was
done in a room that was lit with low light was measured, as was the
time it took for the same clients to go into a trance in a brightly
lit room. The theory being tested does not predict which...
Caitlin is interested in studying how the quality of someone’s romantic relationship affects his or her...
Caitlin is interested in studying how the quality of someone’s
romantic relationship affects his or her ability to solve problems.
Because she has a causal hypothesis, she needed to conduct an
experiment. Because she cannot randomly assign people to high- and
low-quality relationships, she came up with a creative idea for
manipulating her IV: She will have her participants write a
positive or negative story about their current romantic
relationship and then have them immediately solve some math
problems (DV)....
2. A researcher believes that smoking affects a person’s sense of smell. To test this, he...
2. A researcher believes that smoking affects a person’s sense
of smell. To test this, he takes a sample of 25 smokers and gives
them a test of olfactory sensitivity. In this test, higher scores
indicate greater sensitivity. For his sample, the mean score on the
test is 14.8 with a standard deviation of 2.4. The researcher knows
the mean score in the population is 16.2, but the population
standard deviation is unknown.
(a) What are the null and alternative...
A researcher is interested in studying the effect that the amount of fat in the diet...
A researcher is interested in studying the effect that the
amount of fat in the diet and amount of exercise has on the mental
acuity of middle-aged women. The researcher used three different
treatment levels for the diet and two levels for the exercise. The
results of the acuity test for the subjects in the different
treatment levels are shown below.
Diet
Exercise
<30% fat
30% - 60% fat
>60% fat
<60 minutes
4
3
2
4
1
2
2...
A researcher is interested in studying the effect that the amount of fat in the diet...
A researcher is interested in studying the effect that the
amount of fat in the diet and amount of exercise has on the mental
acuity of middle-aged women. The researcher used three different
treatment levels for the diet and two levels for the exercise. The
results of the acuity test for the subjects in the different
treatment levels are shown below.
Diet
Exercise
<30% fat
30% - 60% fat
>60% fat
<60 minutes
4
3
2
4
1
2
2...
A researcher is interested in studying the effect that the amount of fat in the diet...
A researcher is interested in studying the effect that the
amount of fat in the diet and amount of exercise has on the mental
acuity of middle-aged women. The researcher used three different
treatment levels for the diet and two levels for the exercise. The
results of the acuity test for the subjects in the different
treatment levels are shown below.
Diet
Exercise
<30% fat
30% - 60% fat
>60% fat
<60 minutes
4
3
2
4
1
2
2...
A researcher at the Annenberg School of Communication is interested in studying the use of smartphones...
A researcher at the Annenberg School of Communication is
interested in studying the use of smartphones among young adults.
She wants to know the average amount of time that college students
in the United States hold a smartphone in their hand each day. The
researcher obtains data for one day from a random sample of 25
college students (who own smartphones). She installs an app that
registers whenever the smartphone is being held and the screen is
on. The sample...
A researcher is interested in studying the effects of out-of-wedlock childbearing on the subsequent earnings of...
A researcher is interested in studying the effects of
out-of-wedlock childbearing on the subsequent earnings of young
women. Her sample consists of unmarried women who have had no more
than one successful pregnancy (i.e. one kid or one batch of twins).
Her dependent variable is annual earnings while her independent
variable of interest is each woman’s number of children. She plans
to include measures of ethnicity, educational attainment, and local
economic factors in her regression equation. There are likely to...
ADVERTISEMENT
ADVERTISEMENT
Latest Questions
- explain the difference between quantitative and qualitative research strategies. Provide an example of a crime based...
- use postorder and inorder tree traversals to make preorder traversal. #!/usr/bin/env python3 # encoding: UTF-8 """Turning...
- 1. Write an if-else statement to describe an object. Print "Balloon" if isBalloon is true and...
- An investor is considering purchasing a Treasury bond with a 20 year maturity, an 8% coupon...
- Write a program that copies the contents of one file to a destination file. This program...
- how to conduct a marketing mix for 3d crest white strips
- Is big data analytics used for service innovation at Amazon? If so, please write a brief...
ADVERTISEMENT