I would like clear solutions on how to solve the following problems, and answers.
Question 1
A psychologist examined the effect of chronic alcohol abuse on memory. In this experiment a standardized memory test was used. Scores for the general population on this test form a normal distribution with μ = 48.00 and population standard deviation σ = 8.00. A sample of n = 45 alcohol abusers has a mean score of M = 42.00. Is there evidence for memory impariment among alcoholics? Use an alpha level of .01 for a onetail test. (NOTE: Questions 1a1h are for this question)â€¨What is the null hypothesis?

a. 
μ ≠ 48.00 

b. 
μ < 48.00 

c. 
μ = 48.00 

d. 
μ > 48.00 
Question 2
What is the alternative hypothesis (H_{1})?

a. 
μ = 48.00 

b. 
μ > 48.00 

c. 
μ < 48.00 

d. 
μ ≠ 48.00 
Question 3
. What is the critical value?â€¨â€¨
. 
. a. 
. z _{critical} = 2.33â€¨ 
. 
. b. 
. z _{critical} = 2.33â€¨ 
. 
. c. 
. z _{critical} = + 2.58â€¨ 
. 
. d. 
. z _{critical} = + 1.96â€¨ 
Question 4
. standard error of the mean (σm) = ?â€¨â€¨

a. 
5.63 

b. 
1.19 

c. 
0.18 

d. 
0.42 
Question 5
z = ?

a. 
z = 1.07 

b. 
z = 5.04 

c. 
z = 1.07 

d. 
z = 5.04 
Question 6
What is the correct decision regarding this hypothesis test?

a. 
Reject Ho, z = 5.04, p < .01 

b. 
Reject Ho, z = 5.04, p < .01 

c. 
Fail to Reject Ho, z = 1.07, p > .01 

d. 
Fail to Reject Ho, z = 1.07, p > .01 
Question 7
Calculate the effect size. d = ?
Size of effect (small, medium, or large)?
Question 8
Describe the results in plain English and include a description of the 90% confidence interval.
Question 9
For a normal population with μ = 83.00 and standard deviation σ = 16.00, what is the probability of obtaining a sample mean of M > 76.00.â€¨a. For a random sample of n = 4 scores?â€¨
σ_{m} =
z =
â€¨â€¨proportion/probability =
b. For a random sample of n = 16 scores?â€¨
σ_{m} =
â€¨â€¨z =
proportion/probability =
c. For a random sample of n = 32 scores?â€¨
σ_{m} =
â€¨â€¨z =
proportion/probability =
Question 10
A college professor has noted that this year's freshmen class appears to be smarter than classes from previous years. The professor obtains a sample of n=48 freshmen and computes an average IQ of M = 112.68 with a sample variance (s^{2}) = 285.36 for this group. College records indicate that the mean IQ for entering freshmen from earlier years is μ = 106.32. On the basis of the sample data, can the professor conclude that this year's students have IQs that are significantly different from those of previous students? Use a twotailed test with an alpha level = .05. (NOTE: Questions 3a3h are for this question)â€¨What is the null hypothesis?

a. 
μ ≠ 112.68 

b. 
μ ≠ 106.32 

c. 
μ = 112.68 

d. 
μ = 106.32 
Question 11
What is the alternative hypothesis?

a. 
μ = 106.32 

b. 
μ ≠ 112.68 

c. 
μ ≠ 106.32 

d. 
μ = 112.68 
Question 12
What is the critical value = ?

a. 
+ 1.684 

b. 
+ 1.96 

c. 
+ 2.021 

d. 
+ 2.33 
Question 13
standard error (s_{m}) = ?

a. 
5.95 

b. 
41.19 

c. 
2.84 

d. 
2.44 
Question 14
. Calculated t = ?â€¨â€¨

a. 
2.607 

b. 
1.069 

c. 
2.239 

d. 
0.154 
Question 15
What is the decision?

a. 
Fail to Reject Ho, t(47) = 0.154, p > .05 

b. 
Reject Ho, t(47) = 2.239, p < .05 

c. 
Fail to Reject Ho, t(47) = 1.069, p > .05 

d. 
Reject Ho, t(47) = 2.607, p < .05 
Question 16
Calculate the effect size. d = ?
Size of effect (small, medium, or large)?
Question 17
Describe the results in plain English and include a description of the 80% confidence interval.
Subject  Mathematics 
Due By (Pacific Time)  07/16/2014 03:00 pm 
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