Forced expiratory volume for 1 sec (FEV 1.0 , liters BTPS ) is a measure of the
ID: 3224396 • Letter: F
Question
Forced expiratory volume for 1 sec (FEV1.0, litersBTPS) is a measure of the total volume of air expelled by the lungs in the first second of a single maximal exhalation. Factors that predict FEV1.0 include gender (males > females), height (taller > shorter), and age (younger > older). FEV1.0 and percent predicted FEV1.0 were measured in EXSC 415 students (n=23 males; n=37 females) as part of the pulmonary function lab. The table below has summary descriptive statistics for females (below row 37) and males (below row 60) which will be useful in answering the questions.
Part A) FEV1.0 and % Predicted FEV1.0 are ratio-level variables. Based on the available data (X±s; X vs. Median)), FEV1.0 appears to be normally distributed for males and females.
a. True
b. False
Part B) What is the appropriate statistical procedure to test H0: XMales= XFemales for FEV1.0 and % Predicted FEV1.0?
a. dependent t-test
b. independent t-test
c. oneway ANOVA
d. repeated measures ANOVA
e. Pearson product moment correlation coefficient
Part C) What is the critical statistic to test H0: XMales= XFemales for FEV1.0 and % Predicted FEV1.0 at =0.05 (1 tailed test)?
a. 1.297
b. 1.672
c. 2.002
d. 2.393
Part D) Select the incorrect statement below.
a. Based on the criterion for statistical significance in question #35, reject H0: XMales= XFemales for FEV1.0 and conclude within the limits of the data that males have a significantly greater FEV1.0 (4.69±0.73 l) than females (3.33±0.49 l).
b. Based on the criterion for statistical significance in question #35, fail to reject H0: XMales=
XFemales for %Predicted FEV1.0 and conclude within the limits of the data there is no difference between males (103.8±15%) than females (99.78±11%).
c. The selection of =0.05 as a criterion for statistical significance resulted in greater power compared to =0.01.
d. There was no basis for conducting a 1-tailed test.
Gender ID Gender Age (yrs) Ht, (m) FEV LoBTPs Pre FEV Squares of Squares 1 F 20 1.68 3.07 87.2194 0.06887 156.65253 Females F 22 1.65 3.354 103.395 0.0000031 13.4183021 3 F 21 1.68 3.064 91.714 0.074 222 75.005497 4 21 1.60 3.49 112.945 0.02483 17 4.38294 F 21 1.5 2.41 82.179 0.85088 286.08781 R 20 1.60 2.96 95T929 01387 15.316664 F 22 1.63 3.13 98.7382 0.04008 0.9876974 F 22 1.37 2.92 983 165 0.1701 2.003645 10 R 26 1.65 3.23 102.2154 0.0109 61662319 11 F 21 3.76 109.942 018 282 104.234 112 21 1.65 3.444 105.3211 001 157 33.317991 13 21 4.083 113.649 055886 193.6839 5.8944 15 F 21 1.37 3.10 103.679 0.05402 15.378255 16 F 20 1.37 3.31 111.7 3 0.03 145.23 719 17 22 1.5 2.91 106.985 017 32.610276 19 F 22 1.37 2.744 97.5089 035097 9421879 20 21 1.63 3.54 114.493 038139 217.879085 24 22 1.65 3.193 90.8832 0.02029 78.301 423 26 R 29 1.69 3.12 92 0.04513 4.263661 27 F 20 1.63 3.36 96. 3 0.0000076 8.4217713 28 F 21 1.63 4.343 125.797 1.015 679 38951 31 21 1.61 4.317 112.629 1.07655 166 329 5 32 21 3.81 102.695 022807 8.7 1845 34 21 1.65 2.48 70.255 072664 868.89 603 35 22 1.63 3.864 112.65 027 833 172.48 37 F 21 1.6 3.20 100 0.01754 0.071824 m 123.3 369 0.08 Count 37 Mean) 333 243 19.32 Krstandard Deviation) 0.489029 11.00083Explanation / Answer
Answer:
Part A) FEV1.0 and % Predicted FEV1.0 are ratio-level variables. Based on the available data (X±s; X vs. Median)), FEV1.0 appears to be normally distributed for males and females.
Answer a. True
b. False
Part B) What is the appropriate statistical procedure to test H0: XMales= XFemales for FEV1.0 and % Predicted FEV1.0?
a. dependent t-test
Answer: b. independent t-test
c. oneway ANOVA
d. repeated measures ANOVA
e. Pearson product moment correlation coefficient
Part C) What is the critical statistic to test H0: XMales= XFemales for FEV1.0 and % Predicted FEV1.0 at =0.05 (1 tailed test)?
a. 1.297
Answer: b. 1.672
c. 2.002
d. 2.393
Part D) Select the incorrect statement below.
d. There was no basis for conducting a 1-tailed test.
Answer:
Separate-Variances t Test for the Difference Between Two Means
(assumes unequal population variances)
Data
Hypothesized Difference
0
Level of Significance
0.05
Population 1 Sample
Sample Size
23
Sample Mean
4.69
Sample Standard Deviation
0.7300
Population 2 Sample
Sample Size
37
Sample Mean
3.33
Sample Standard Deviation
0.4900
Intermediate Calculations
Numerator of Degrees of Freedom
0.0009
Denominator of Degrees of Freedom
0.0000
Total Degrees of Freedom
34.3999
Degrees of Freedom
34
Standard Error
0.1722
Difference in Sample Means
1.3600
Separate-Variance t Test Statistic
7.8970
Upper-Tail Test
Upper Critical Value
1.6909
p-Value
0.0000
Reject the null hypothesis
Pooled-Variance t Test for the Difference Between Two Means
(assumes equal population variances)
Data
Hypothesized Difference
0
Level of Significance
0.05
Population 1 Sample
Sample Size
23
Sample Mean
103.8
Sample Standard Deviation
15
Population 2 Sample
Sample Size
37
Sample Mean
99.78
Sample Standard Deviation
11
Intermediate Calculations
Population 1 Sample Degrees of Freedom
22
Population 2 Sample Degrees of Freedom
36
Total Degrees of Freedom
58
Pooled Variance
160.4483
Standard Error
3.3634
Difference in Sample Means
4.0200
t Test Statistic
1.1952
Two-Tail Test
Lower Critical Value
-2.0017
Upper Critical Value
2.0017
p-Value
0.2369
Do not reject the null hypothesis
Separate-Variances t Test for the Difference Between Two Means
(assumes unequal population variances)
Data
Hypothesized Difference
0
Level of Significance
0.05
Population 1 Sample
Sample Size
23
Sample Mean
4.69
Sample Standard Deviation
0.7300
Population 2 Sample
Sample Size
37
Sample Mean
3.33
Sample Standard Deviation
0.4900
Intermediate Calculations
Numerator of Degrees of Freedom
0.0009
Denominator of Degrees of Freedom
0.0000
Total Degrees of Freedom
34.3999
Degrees of Freedom
34
Standard Error
0.1722
Difference in Sample Means
1.3600
Separate-Variance t Test Statistic
7.8970
Upper-Tail Test
Upper Critical Value
1.6909
p-Value
0.0000
Reject the null hypothesis
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.