Statistics for Social Sciences: PSY 230

1. For each research study below, you need to identify the null and alternative hypotheses, what type of stat will you use andJUSTIFY WHY, Identify the IV and DV OR the X and Y. Is it a one tailed or two tailed test?

A random sample of 10^th grade students were placed in a special program to improve Math skills and help pass the MCAS. The sample mean for the group is 44 and the rest of the school had a sample mean of 41.Does this group help?

Ho:

Ha:

IV:

DV:

How many tails?

WHAT stat will you use?

A researcher is interested in knowing if lighting has an impact on academia. He takes two stats classes both occurring at 9:00 am until 11:40 am. In one class, he leaves the lights off for the entirety of the semester. In the other class, he leaves the lights on for the entirety of the semester. At the end of the semester, he uses their scores on the final exam to determine if there exists a difference on academia based on lighting.

Ho:

Ha:

IV:

DV:

How many tails?

WHAT stat will you use?

Dr. Devane has developed a new dog food that she thinks will improve the stamina of dogs. She has the owners feed the dogs their regular food for one month and she tests their energy/stamina by recording the number of minutes they chase a ball before they lie down. She waits 4 weeks. Then she has the owners of the dogs feed the new food she created for one month.Again, they record the number of minutes their dogs chase a ball before they lie down

Ho:

Ha:

IV:

DV:

How many tails?

WHAT stat will you use?

Dr Conboy is interested in whether or not his students in the graduate class of Psychometrics will score higher than the general population on an IQ exam. He administers the IQ test to his students and compares their scores to the norm (M = 100, SD = 15).

Ho:

Ha:

IV:

DV:

How many tails?

WHAT stat will you use?

My daughter's 7^th grade project for her science fair examined the effects of both leavening agent (baking powder or baking salt) and type of fat (oil, butter or mayonnaise) on the texture of her cupcakes.

Ho:

Ha:

IV:

DV:

How many tails?

WHAT stat will you use?

I am very interested in knowing if how many hours of sunlight a person receives each day impacts their scores on the Beck's Depression Inventory. I survey 100 students at Bristol and ask them the average number of hours of sunlight they get daily. I administer the Beck's.

Ho:

Ha:

X:

Y:

How many tails?

WHAT stat will you use?

Does getting sick to your stomach cause an aversion to alcohol and therby, decrease the amount a person will consume? To test this, you randomly assign 10 clients diagnosed with alcohol use disorder to a group that receives anabuse (a drug that makes them violently vomit if they consume alcohol). The other group gets a sugar pill. They ALL record the number of alcoholic beverages they consume throughout the week.

Ho:

Ha:

IV:

DV:

How many tails?

WHAT stat will you use?

How many tails?

Dr Nomack believes that Obsessive compulsive disorder can best be treated by using a combination of SSRI's and cognitive therapy.He currently has 1,000 clients diagnosed with this disorder who are being seen in his practices. He has randomly assigned each client into one of the following treatments groups: No therapy; SSRI alone; CBT alone; SSRI and CBT in combination; Psychoanalytical therapy and Reality therapy. After a 12-week interim, he then assesses all 1,000 clients on the Big T Obsession and Compulsion rating scale. He expects that those clients who are receiving both SSRI's and CBT will manifest the best scores on the OCD rating scale.

Ho:

Ha:

IV:

DV:

How many tails?

WHAT stat will you use?

2. 4 pointsWhat happens to the probability of committing a Type I error if the level of significance is changed fromalpha = 0.01 toalpha = 0.05?What happens to the probability of committing a Type II error?

3. 14 pointsI am interested in knowing whether the students in my abnormal psychology class perform differently than all the other students from Mass colleges on their GRE subject test. The average GRE psychology subject test score is (M = 600, SD = 88).

Here is my data set for my 3 sections of abnormal classes

630	560	620	610
620	580	630	600
570	660	640	540
640	680	610	560
585	540	590	570
600	550	580	590
610	600	570	610
535	610	560	620

1. What type of test and why did I choose this specific test?
2. Do the Null and alternative hypotheses.
3. What is my obtained statistical value and my critical value?
4. Is it significant, how do you know?
5. Do I reject my null?
6. Write the sentence and A P A statistics format for these results.
7. SUBMIT ALL SPSS output matrices here

4. 14 pointsDr Letendre is studying the ramifications of caffeine consumption on memory in white lab mice. He has 25 mice he assigns to a group that drinks pure water. Then next 25 mice are assigned to a group that consumes 25 mg of caffeine per day. After a period of one month, he has all mice learn a maze and times their completion in minutes. I have listed the data below. Please analyze the data using SPSS.

Group	Minutes To complete Maze
caffeine	23	1
Caffeine	24	2
none	25	3
None	21	4
None	18	5
Caffeine	30	6
Caffeine	22	7
Caffeine	23	8
None	23	9
None	21	10
Caffeine	17	11
Caffeine	18	12
None	44	13
Caffeine	41	14
None	13	15
None	18	16
Caffeine	19	17
Caffeine	20	18
Caffeine	22	19
None	26	20
Caffeine	23	21
None	24	22
Caffeine	25	23
None	26	24
None	27	25
None	33	26
None	33	27
Caffeine	38	28
Caffeine	31	29
None	12	30
None	13	31
None	18	32
Caffeine	26	33
Caffeine	19	34
Caffeine	10	35
None	41	36
None	21	37
Caffeine	12	38
Caffeine	26	39
None	12	40
Caffeine	62	41
None	44	42
None	42	43
Caffeine	12	44
Caffeine	28	45
Caffeine	22	46
None	20	47
Caffeine	22	48
None	27	49
None	20	50

1. What type of test and why did I choose this specific test?
2. Do the Null and alternative hypotheses.
3. What is my obtained statistical value and my critical value?
4. Is it significant, how do you know?
5. Do I reject the null?
6. Write the sentence and A P A statistics format for these results.
7. Submit ALL SPSS output matrices

1. 14 pointsDr. Timmons theorizes that the type of lighting in a classroom makes a difference on how well a student can remember. She decides to study the effect of lighting by putting subject into one of three groups based on chance: 21 students are put in a classroom that has no lighting; 21 students are put in a classroom with fluorescent lighting and Group 3, 21 students subjected to LED lighting. She allows students to study a list of nonsense words. Then she waits 20 minutes and administers a recall task. Here is the data. She asks you to analyze this for her research.

Lighting	Words remembered
None	23
LED	29
LED	18
None	12
Fluorescent	22
LED	17
Fluorescent	28
Fluorescent	27
None	25
None	12
LED	18
LED	21
None	20
Fluorescent	16
LED	20
Fluorescent	21
Fluorescent	28
None	31
None	15
LED	16
LED	22
None	18
Fluorescent	32
LED	18
Fluorescent	30
Fluorescent	31
None	19
None	10
LED	19
LED	17
None	20
Fluorescent	27
LED	28
Fluorescent	29
Fluorescent	28
None	22
None	19
LED	22
LED	22
None	13
Fluorescent	26
LED	19
Fluorescent	31
Fluorescent	28
None	18
None	7
LED	27
LED	24
None	14
Fluorescent	27
LED	22
Fluorescent	30
Fluorescent	31
None	11
None	12
LED	21
LED	20
None	13
Fluorescent	28
LED	19
Fluorescent	29
Fluorescent	26
None	18

1. What type of test and why did I choose this specific test?
2. Do the Null and alternative hypotheses.
3. What is my obtained statistical value and my critical value?
4. Is it significant, how do you know?
5. Do I reject the null?
6. Write the sentence and A PA statistics format for these results.
7. SUBMIT ALL SPSS output matrices

1. I am interested in knowing if studying in a study group raises students scores on the final exam. So I administer a practice final on Tuesday and score their work. Then I assign every student to a group with similar questions. Two weeks later I administer an equal but different final exam.My Data set below shows the students' scores before group and after group work.

68	74
72	88
91	96
83	83
76	88
62	81
77	90
81	86
69	97
77	79
87	92
88	89
73	97
54	59
70	77
71	78
93	98
63	85

1. What type of test and why did I choose this specific test?
2. Do the Null and alternative hypotheses.
3. What is my obtained statistical value and my critical value?
4. Is it significant, how do you know?
5. Do I reject the null?
6. Write the sentence and A P A statistics for these results.
7. SUBMIT ALL SPSS output matrices

1. Analyze this data using SPSS and report the results in A P A format. Please put the SPSS output matrices.

Jacob is working in Boston Children's Hospital looking at APGAR scores of newborns and is comparing them to the scores that parents received at a prenatal wellness 16 week workshop. He is theorizing that parents who had higher scores on the prenatal workshop will have babies with higher APGAR at birth:The healthier the mamma, the healthier the baby!

Here are their scores:

Prenatal APGAR

28	5
26	5
21	4
20	4
20	4
12	2
10	2
13	2

Analyze the above data in SPSS and put the output matrices. In a well thought response, please explain the finding in A P A formatting.