Question

**:** Identify IV, DV, and hypotheses and evaluate
the null hypothesis for an independent samples *t* test.

**Data:** Use the information from Problem Set
3.7.

**Instructions:** Complete the following:

Minutes of practice:

Group 1: 34, 25, 4, 64, 14, 49, 54

Group 2: 24, 78, 59, 68, 84, 79, 57

a. Identify the IV and DV in the study.

b. State the null hypothesis and the directional (one-tailed) alternative hypothesis.

c. Can you reject the null hypothesis at α = .05? Explain why or why not.

Answer #1

a. Identify the IV and DV in the study.

IV = Minutes of practice

b. State the null hypothesis and the directional (one-tailed) alternative hypothesis.

The hypothesis being tested is:

H_{0}:
µ_{1}
= µ_{2}

H_{1}:
µ_{1}
< µ_{2}

c. Can you reject the null hypothesis at α = .05? Explain why or why not.

Group 1 | Group 2 | |

34.86 | 64.14 | mean |

21.99 | 20.46 | std. dev. |

7 | 7 | n |

12 | df | |

-29.286 | difference (Group 1 - Group 2) | |

450.976 | pooled variance | |

21.236 | pooled std. dev. | |

11.351 | standard error of difference | |

0 | hypothesized difference | |

-2.580 | t | |

.0120 | p-value (one-tailed, lower) |

The p-value is 0.0120.

Since the p-value (0.0120) is less than the significance level (0.05), we can reject the null hypothesis.

Therefore, we can conclude that
µ_{1}
< µ_{2}.

Dr. Z divides her clients with depression into 2 groups. She
asks Group 1 not to watch or read any news for two weeks while in
therapy and asks Group 2 to continue with therapy as normal. The
groups scored the following on measure of depression: Minutes of
practice: Group 1: 34, 25, 4, 64, 14, 49, 54 Group 2: 24, 78, 59,
68, 84, 79, 57 How do I find the independent and dependent
variables? how would i compose...

question 34:
for the exam results below, test the null hypothesis that the
two independent samples come from similar populations.
group A: 70, 96, 77, 90, 81, 45, 55, 68, 74, 99, 88
Group B: 89, 92, 60, 78, 84, 96, 51, 67, 85, 94
- what is the value of the observed test statistic?
- what is the critical value?
- reject or fail to reject?

#10. You are to determine if a new
online teaching model is better than the existing model, labelled
old. You administer random tests to a pre-selected group of
students first for material taught the old model and then under the
new model. The data is given in the Excel file and is labelled
problem # 10. Carry out an appropriate procedure in hypothesis
testing to determine if the new model is more effective for
learning.
new
old
78
4
86...

This dataset contains consumer responses indicating the number
of times they had to send their product for repair and their
satisfaction with the repair process. Create a graph which can be
used to visually demonstrate the relationship between the two
columns of data. Ensure that the chart is professional with
appropriate titles, axis labels, etc. Note any observations you see
in your visualization (type these as sentences directly into an
Excel cell(s)).
Sample
Satisfaction Rating
Repair Requests
1
63%
13...

Write the null and alternative hypothesis for a two-tailed test
for each of the following variables: (10 points)
Student Ht Wt Age (Yrs) Shoe Size Waist Size Pocket
Change
01 64 180 39 07 36 018
02 66 140 31 09 30 125
03 69 130 31 09 25 151
04 63 125 36 07 25 011
05 68 155 24 08 31 151
06 62 129 42 06 32 214
07 63 173 30 08 34 138
08 60...

You want to test the null hypothesis that the mean amount spent
is less than or equal to $1,400 versus a one-tailed alternative.
Which of the following is the p-value for the test? (Because of
potential roundoff, choose the closest.)
Person
Gender
Married
Age
Children
Salary
Spent
1
Male
No
40
1
107800
1040
2
Male
Yes
41
1
62500
2140
3
Female
Yes
50
3
80000
810
4
Male
Yes
65
3
111400
3370
5
Female
Yes
51
1...

StudentNO
Gender
Height in inchese
1
Female
63
2
Female
64.0
3
Male
67.0
4
Female
59
5
Male
60
6
Female
61
7
Female
62
8
Female
63
9
Female
63
10
Female
64
11
Male
64
12
Female
65
13
Female
65
14
Female
65
15
Female
65
16
Female
66
17
Female
66
18
Male
67
19
Male
67
20
Male
67
21
Female
67
22
Male
67
23
Male
67
24
Female
67.5
25
Male
68...

An administrator said that he believes that 50% of all students
have more than 60 credit hours. Use the data found in the column
labeled “More than 60 credit hours attained” to answer this
question. “No” means that the student has not attained more than 60
credit hours. “Yes” means that the student has attained more than
60 credit hours.
a. Write the claim in symbolic form
b. Write the null and alternative hypothesis in symbolic
form
c. State the...

The vice president of the student organization has asked you to
create an estimate of the proportion of students who have attained
more than 60 credit hours. You ask her what level of confidence she
wants to have in the estimate and she says that she would like to
be 90% confident in the proportion estimate. Create the confidence
interval using the sample data. Write a sentence or two to
communicate the results to her.
Student
More than 60 credit...

Instructions: In 1974, Loftus and Palmer conducted a
classic study demonstrating how the language used to ask a question
can influence eyewitness memory. In the study, college students
watched a film of an automobile accident and then were asked
questions about what they saw. One group was asked, “About how fast
were the cars going when they smashed into each other?” Another
group was asked the same question except the verb was changed to
“hit” instead of “smashed into.” The...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 5 minutes ago

asked 5 minutes ago

asked 15 minutes ago

asked 35 minutes ago

asked 41 minutes ago

asked 54 minutes ago

asked 54 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago