Homework Answers
x=before
y=after
d= after-before=y-x
| sr.no | x | y | d=y-x | d-d̅ | (d-d̅)2 |
| 1 | 3 | 4 | 1 | -0.5 | 0.25 |
| 2 | 4 | 5 | 1 | -0.5 | 0.25 |
| 3 | 3 | 6 | 3 | 1.5 | 2.25 |
| 4 | 2 | 4 | 2 | 0.5 | 0.25 |
| 5 | 4 | 5 | 1 | -0.5 | 0.25 |
| 6 | 5 | 6 | 1 | -0.5 | 0.25 |
| Total= | 9 | 3.5 | |||
| mean=d̅ | Total/6 | ||||
| d̅= | 1.5 |
Add Answer to:
A study was conducted to test the effectiveness of a juggling class. Before the class started,...
Question 2 1 pts A teacher proposes a course designed to increase reading speed. To evaluate...
Question 2 1 pts A teacher proposes a course designed to increase reading speed. To evaluate the effectiveness of this course, the teacher tests students before and after the course. The result is following student 1 2 3 4 5 Speed before class 100 160 120 167 200 Speed after class 136 170 135 169 210 The difference in the reading speeds (before-after) for this sample results in d = –14.6 and 8d = 12.84. Assume that the reading speeds...
A test of abstract reasoning is given to a random sample of students before and after...
A test of abstract reasoning is given to a random sample of students before and after completing a formal logic course. The results are shown below. Before 74 83 75 88 84 63 93 84 91 77 After 73 77 70 77 74 67 95 83 84 75 Suppose a researcher wants to test whether the mean score after the course differs from the mean score before the course. Assume that the mean score differences of Before and After completing...
A study was conducted to investigate the effectiveness of hypnotism in reducing pain. Results for randomly...
A study was conducted to investigate the effectiveness of hypnotism in reducing pain. Results for randomly selected subjects are given in the following table. Use a-0.05 Subjects | A | B | C | D | E | F | G Before6.6 6.5 9.0 10.3 11.3 8.1 6.3 11.6 After 6.8 2.4 7.48.5 8.1 6.1 3.42.0 a) Identify the hypotheses, (Ho and H b) Find the margin of error c) Construct a 95% confidence interval estimate of the mean "before-after"...
Consider the following matched-pairs sample that represents observations before and after an experiment. Assume that the...
Consider the following matched-pairs sample that represents observations before and after an experiment. Assume that the sample differences are normally distributed. Hint: The differences are calculated as Xafter - Xbefore. (You may find it useful to reference the appropriate table: z table or t table) Before After 2.5 2.9 1.8 3.1 1.4 -2.9 3.9 -1.8 1.2 -1.9 -3.1 0.2 0.6 2.5 2.5 2.9 Click here for the Excel Data File a. Construct the competing hypotheses to determine if the experiment...
5. Effectiveness of Hypnotism in Reducing Back Pain A study was conducted to investigate the effectiveness...
5. Effectiveness of Hypnotism in Reducing Back Pain A study was conducted to investigate the effectiveness of hypnotism in reducing back pain. The values are before and after hypnosis and are measurements given on a pain scale. [Journal of Abnormal Psychology, Vol 96, No. 1, Price & Barber] [3 decimal places] Subject A B C D E F G H Before 6.6 6.5 9.0 10.3 11.3 8.1 6.3 11.6 After 6.8 2.4 7.4 8.5 8.1 6.1 3.4 2.0 Use...
An advertising company wants to test the effectiveness of a TV advertisement. A focus group of...
An advertising company wants to test the effectiveness of a TV advertisement. A focus group of 10 potential consumers is randomly selected. Each person is surveyed before and after viewing the TV ad and assigned a score (both before and after) to measure the likelihood that they would buy the advertised product. A higher score means the consumer is more likely to buy the product. Population standard deviation (sigma) is unknown. The hypothesis test yields a p-value = .0012. a.Write...
7.2.13-T before the best A clinical trial was conducted to test the effectiveness of a drug...
7.2.13-T before the best A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before treatment, 23 subjects had a mean wake time of 105,0 min. After treatment the 23 subjects had a mean wake time of 100.4 min and a standard deviation of 20.1 min. Assume that the 23 sample values appear to be from a normally distributed population and construct a 90% confidence interval estimate of the mean wake time...
Question Help In a test of the effectiveness of garlic for lowering cholesterol, 49 subjects were...
Question Help In a test of the effectiveness of garlic for lowering cholesterol, 49 subjects were treated with raw garlic. Cholesterol levels were measured before and after the treatment. The changes (before minus after) in their levels of LDL cholesterol (in mg/dL) have a mean of 0.8 and a standard deviation of 24.3. Use a 0.10 significance level to test the claim that with garlic treatment, the mean change in LDL cholesterol is greater than 0. What do the results...
A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in...
A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before treatment, 22 subjects had a mean wake time of 103.0 min. After treatment, the 22 subjects had a mean wake time of 77.2 min and a standard deviation of 22.6 min. Assume that the 22 sample values appear to be from a normally distributed population and construct a 99% confidence interval estimate of the mean wake time for a population with...
Quel He Rhino viruses typically cause common colds. In a test of the effectiveness of echinacea,...
Quel He Rhino viruses typically cause common colds. In a test of the effectiveness of echinacea, 39 of the 46 subjects treated with echinacea developed rhinovirus infections. In a placebo group. 73 of the 90 subjects developed rhinovirus infections. Use a 0.01 significance level to test the claim that echinacea has an effect on rhinovirus infections. Complete parts (a) through (c) below. a. Test the claim using a hypothesis test. Consider the first sample to be the sample of subjects...
Question 2 1 pts A teacher proposes a course designed to increase reading speed. To evaluate the effectiveness of this course, the teacher tests students before and after the course. The result is following student 1 2 3 4 5 Speed before class 100 160 120 167 200 Speed after class 136 170 135 169 210 The difference in the reading speeds (before-after) for this sample results in d = –14.6 and 8d = 12.84. Assume that the reading speeds...
A test of abstract reasoning is given to a random sample of students before and after completing a formal logic course. The results are shown below. Before 74 83 75 88 84 63 93 84 91 77 After 73 77 70 77 74 67 95 83 84 75 Suppose a researcher wants to test whether the mean score after the course differs from the mean score before the course. Assume that the mean score differences of Before and After completing...
A study was conducted to investigate the effectiveness of hypnotism in reducing pain. Results for randomly selected subjects are given in the following table. Use a-0.05 Subjects | A | B | C | D | E | F | G Before6.6 6.5 9.0 10.3 11.3 8.1 6.3 11.6 After 6.8 2.4 7.48.5 8.1 6.1 3.42.0 a) Identify the hypotheses, (Ho and H b) Find the margin of error c) Construct a 95% confidence interval estimate of the mean "before-after"...
Consider the following matched-pairs sample that represents observations before and after an experiment. Assume that the sample differences are normally distributed. Hint: The differences are calculated as Xafter - Xbefore. (You may find it useful to reference the appropriate table: z table or t table) Before After 2.5 2.9 1.8 3.1 1.4 -2.9 3.9 -1.8 1.2 -1.9 -3.1 0.2 0.6 2.5 2.5 2.9 Click here for the Excel Data File a. Construct the competing hypotheses to determine if the experiment...
7.2.13-T before the best A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before treatment, 23 subjects had a mean wake time of 105,0 min. After treatment the 23 subjects had a mean wake time of 100.4 min and a standard deviation of 20.1 min. Assume that the 23 sample values appear to be from a normally distributed population and construct a 90% confidence interval estimate of the mean wake time...
Question Help In a test of the effectiveness of garlic for lowering cholesterol, 49 subjects were treated with raw garlic. Cholesterol levels were measured before and after the treatment. The changes (before minus after) in their levels of LDL cholesterol (in mg/dL) have a mean of 0.8 and a standard deviation of 24.3. Use a 0.10 significance level to test the claim that with garlic treatment, the mean change in LDL cholesterol is greater than 0. What do the results...
Quel He Rhino viruses typically cause common colds. In a test of the effectiveness of echinacea, 39 of the 46 subjects treated with echinacea developed rhinovirus infections. In a placebo group. 73 of the 90 subjects developed rhinovirus infections. Use a 0.01 significance level to test the claim that echinacea has an effect on rhinovirus infections. Complete parts (a) through (c) below. a. Test the claim using a hypothesis test. Consider the first sample to be the sample of subjects...
Most questions answered within 3 hours.
-
find the critical value associated with a right sided hypothesis of
the mean using a sample...
asked 1 hour ago -
Which of the following statements is true with respect to a
simple linear regression model?
a....
asked 2 hours ago -
The energy required to remove an electron from a surface of a
solid element is called...
asked 3 hours ago -
How would you train your employees to avoid risks of using
mobile devices?
asked 4 hours ago -
Assume Kw = 1.01 ✕ 10−14
For pure water, we can calculate [H3O+ ] = [OH...
asked 5 hours ago -
Suppose that on a temperature scale X, water boils at 203.0°X
and freezes at -105.7°X. What...
asked 5 hours ago -
BaS crystallizes in a cubic unit cell with S2- ions on each
corner and each face....
asked 6 hours ago -
A. 0≤P(Oi)≤10≤P(Oi)≤1 for each i
B. P(Oi)≤0P(Oi)≤0
C. P(Oi)=1+P(OCi)P(Oi)=1+P(OiC)
D. P(Oi)≥1P(Oi)≥1
If an experiment consists of...
asked 7 hours ago -
A battery has an emf of 9.20V and an internal resistance of 1.20
ohm. a)What resistance...
asked 7 hours ago -
The area of an elastic circular loop decreases at a constant
rate, dA/dt = −6.60×10−3 m2/s...
asked 9 hours ago -
The denaturation of proteins can be described by the
equilibrium
F⇌U
where F and U represent...
asked 10 hours ago -
Please answer what the maximum and minimum force is, and the
angle on the ion is...
asked 10 hours ago