text |
no text |
difference |
12 |
27 |
15 |
4 |
24 |
20 |
7 |
23 |
16 |
2 |
5 |
3 |
2 |
0 |
-2 |
3 |
0 |
-3 |
2 |
20 |
18 |
6 |
2 |
-4 |
12 |
20 |
8 |
8 |
11 |
3 |
5 |
6 |
1 |
18 |
10 |
-8 |
24 |
13 |
-11 |
20 |
16 |
-4 |
21 |
18 |
-3 |
2 |
30 |
28 |
9 |
2 |
-7 |
11 |
15 |
4 |
15 |
21 |
6 |
3 |
23 |
20 |
14 |
3 |
-11 |
12 |
12 |
0 |
12 |
10 |
-2 |
16 |
19 |
3 |
10 |
20 |
10 |
M = 10 |
M = 14 |
M = 4 |
s = 6.519 |
s = 8.855 |
s = 10.5 |
1)
Paired t test
2)
Ho : µd= 0
Ha : µd < 0
3)
sample size , n = 25
mean of sample 1, x̅1= 10.000
mean of sample 2, x̅2= 14.000
mean of difference , D̅ =ΣDi / n =
-4.0000
std dev of difference , Sd = √ [ (Di-Dbar)²/(n-1) =
10.5000
std error , SE = Sd / √n = 10.5000 /
√ 25 = 2.1000
t-statistic = (D̅ - µd)/SE = ( -4
- 0 ) / 2.1000
= -1.905
4)
Degree of freedom, DF= n - 1 =
24
t-critical value , t* = --1.7109
[excel function: =t.inv(α,df) ]
5)
cohen's d = |Dbar/ std dev| = 0.381
Please let me know in case of any doubt.
Thanks in advance!
Please upvote!
Based on previous research, an academic advisor predicted that tardiness would decrease if students were asked...
In a medical research class the students were asked to find out the time of their birth. of the 38 students in the class, 18 were born between 12 am and 11:59 am. If we pick 5 students at random: a) create a probability distributions for the number of students born between 12 am and 11:59 am (A) (label columns and rows; use only what you need; show work-some or all) b) what is the probability of having 2 or...
Question 1. Thirty graduate students were asked how many credit hours they were taking in the current quarter. Download the available data: Calculate the mean, median, standard deviation, variance, and range for this sample using Excel. Write a sentence explaining what each measure means. What is the standard error of the mean based on the data? What would be the best point estimate for the population credit hours? (“Population” refers to all graduate students’ credit hours in the universe.) What...
In a study on attraction, suppose subjects were asked to rate pictures of females and males taken before and after a face-lift. Subjects rated the pictures on a number of variables. The total attractiveness ratings are given below, with higher numbers meaning higher attractiveness. You are asked to test whether face-lifts improve the looks of the subjects. Subject: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Before: 22 24 26 20 23 22...
s. QUESTION 2 Use minitab Suppose a sample of 20 students were given a diagnostic test before studying a particular module and then again after completing the module. We want to find out if, in general, our teaching leads to improvements in students' knowledge/skills (i.e. test scores). We can use the results from our sample of students to draw conclusions about the impact of this module in general. 92.MPJ 1) check assumption (fort show your correct 3) find the t-value...
Please write answers clear. Will leave like if its correct. Age Gen Sibs Work Exercise Units Mom 18 M 1 20 10 15 6 17 F 3 0 7 15 14 23 M 3 20 5 13 8 20 M 2 0 5 15 16 18 F 4 22 6 16 9 20 F 2 11 7 20 20 34 F 1 48 10 10 18 22 F 3 37 13 13 18 19 M 3 0 18 14 18...
Randomly selected students in a statistics class were asked to report the number of hours they slept on weeknights and on weekends. At α = 0.05, the experimenter wants to know if there is sufficient evidence that there is a difference in the mean number of hours slept. Student 1 2 3 4 5 6 7 8 Hours Sun-Thurs 8 5.5 7.5 8 7 6 6 8 Hours Fri-Sat 4 7 10.5 12 11 9 6 9 a. State the hypotheses and identify the claim. b. A student calculates the test statistic using this formula: Is this the correct formula to use for this situation? (Hint:...
Please write answers clear. I will leave like if its correct. Age Gen Sibs Work Exercise Units Mom 18 M 1 20 10 15 6 17 F 3 0 7 15 14 23 M 3 20 5 13 8 20 M 2 0 5 15 16 18 F 4 22 6 16 9 20 F 2 11 7 20 20 34 F 1 48 10 10 18 22 F 3 37 13 13 18 19 M 3 0 18 14...
Please write in the answer clear. Will leave like if its correct . Age Gen Sibs Work Exercise Units Mom 18 M 1 20 10 15 6 17 F 3 0 7 15 14 23 M 3 20 5 13 8 20 M 2 0 5 15 16 18 F 4 22 6 16 9 20 F 2 11 7 20 20 34 F 1 48 10 10 18 22 F 3 37 13 13 18 19 M 3 0...
On hundred and fifty-one (151) De Anza College students were surveyed and asked two questions: (1) How many units are you taking this quarter, and (2) How many hours of television do you watch per day. The chart below summarizes the data. We wish to conduct a hypothesis test to determine if the number of units a student takes is independent of the number of hours per day of television the student watches. Number of units Hours of T.V. per...
1. (15 pts total) Fourteen students participated in a research study on the effect of sleep deprivation in a motor skill task. The students played the game "Operation" either after a full night of sleep or after being kept awake for 36 hours. Each task was measured two weeks apart. Half of the students were randomly assigned to sleep deprivation in the first week and a full night of sleep in the second week, and the other half completed the...