Question

The Columbus Dispatch conducted a study. Two identical football, one filled with helium and one filled with ordinary air, were used. A casual observer was unable to detect a difference in the two footballs. A novice kicker was used to punt the footballs. A trial consisted of kicking both footballs in a random order. The kicker did not know which football he was kicking. The distance of each punt was recorded, then another trial was conducted. A total of 39 trials were run. Do the data indicate that helium-filled footballs travel farther than air-filled footballs? Give a confidence interval and significance test. (Data: FTBALL)

Helium | Air | Difference |

25 | 25 | 0 |

16 | 23 | -7 |

25 | 18 | 7 |

14 | 16 | -2 |

23 | 35 | -12 |

29 | 15 | 14 |

25 | 26 | -1 |

26 | 24 | 2 |

22 | 24 | -2 |

26 | 28 | -2 |

12 | 25 | -13 |

28 | 19 | 9 |

28 | 27 | 1 |

31 | 25 | 6 |

22 | 34 | -12 |

29 | 26 | 3 |

23 | 20 | 3 |

26 | 22 | 4 |

35 | 33 | 2 |

24 | 29 | -5 |

31 | 31 | 0 |

34 | 27 | 7 |

39 | 22 | 17 |

32 | 29 | 3 |

14 | 28 | -14 |

28 | 29 | -1 |

30 | 22 | 8 |

27 | 31 | -4 |

33 | 25 | 8 |

11 | 20 | -9 |

26 | 27 | -1 |

32 | 26 | 6 |

30 | 28 | 2 |

29 | 32 | -3 |

30 | 28 | 2 |

29 | 25 | 4 |

29 | 31 | -2 |

30 | 28 | 2 |

26 | 28 | -2 |

Answer #1

descriptive statistics
for the given data
4 8 18 20 21 22 23 24 25 26 27 28 29 30 31 31 32 32 33 33 34 35 36
37 38 39 47 53

A study was conducted to see if students’ writing skills
continue to improve as the academic year progresses. English 101
students were asked to write essays throughout the year in
September, December, March and June. The scores were compared to
see if there is any improvement in this one-year course. Was there
a significant improvement?
The appropriate test for this problem is:
one-way ANOVA
repeated measurements
Student
September
December
March
June
1
17
23
21
24
2
25
21
21...

Person
number
X
Value
Y
Value
Person number
X
Value
Y
Value
Person number
X
Value
Y
Value
1
24
30
11
39
42
21
21
27
2
42
53
12
60
65
22
33
29
3
20
27
13
34
40
23
25
27
4
31
30
14
24
26
24
22
25
5
22
24
15
51
57
25
28
33
6
46
47
16
80
83
26
34
40
7
52
60
17
28
27
27
53...

Use Excel to find the following: Compare the height, weight (in
inches), and age for Eagles versus Patriots, using t tests. Provide
the conclusions based on the t tests.
Gaps between numbers under age are no value
77 each
Eagles:
Age
35
28
23
23
29
23
24
31
28
24
24
24
26
31
23
26
25
25
31
29
33
30
22
28
23
24
29
23
24
26
32
26
24
23
29
24
23
30
24...

The results of a sample of 372 subscribers
toWiredmagazine shows the time spent using the Internet
during the week. Previous surveys have revealed that the population
standard deviation is 10.95 hours. The sample data can be found in
the Excel test data file.
What is the probability that another sample of 372 subscribers
spends less than 19.00 hours per week using the Internet?
Develop a 95% confidence interval for the population mean
If the editors of Wiredwanted to have the...

____________________________________________
The results of a sample of 372 subscribers to Wired
magazine shows the time spent using the Internet during the week.
Previous surveys have revealed that the population standard
deviation is 10.95 hours. The sample data can be found in the Excel
test data file.
What is the probability that another sample of 372 subscribers
spends less than 19.00 hours per week using the Internet?
____________________________________________
Develop a 95% confidence interval for the population mean
____________________________________________
If the editors...

Greene and Touchstone conducted a study to relate birth weight
and Estriol level in pregnant women as given in Table-1:
Table: 1 Sample Data from Greene and Touchstone study relating
birth weight and estriol.
i
Estriol (mg/24 hr) xi
Birth weight(g/100) yi
i
Estriol (mg/24 hr) xi
Birth weight(g/100) yi
1
7
25
17
17
32
2
9
25
18
25
32
3
9
25
19
27
34
4
12
27
20
15
34
5
14
27
21
15
34...

Studen Age
28
27
28
30
29
29
35
29
34
29
25
30
28
31
27
27
34
30
26
27
31
32
34
27
31
34
32
29
25
30
32
28
34
28
23
27
30
26
35
31
25
33
29
31
26
33
33
31
38
22
1. Follow a good modeling scheme. Make sure all calculations are
done in Excel
2. Cell
with formulas, intermediate calculations painted light green
3. All
calculations or numbers...

Question 8 British Couples Question 2 A random sample of 25
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What is the p-value of the appropriate test if you want to check if
the average age of British husbands exceed that of the wives by at
least 2 years?
Husband Wife
27 23
29 23
30 26
30 28
28 26
28 24
26 24
28 25
29 24
25 28
27 31
26 28
24...

A health science researcher wants to study the self-esteem of
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victims are shown in the following table:
Less Than High School Diploma
High School Diploma
Some College
Bachelor's Degree and Above
17
22
24
26
15
23
25
27
14
24
26
28
16
25
24
29
17
26
28
30
26
27
29...

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