# Standard test of intelligence

Want create site? With you can do it easy.

# Standard test of intelligence

Standard test of intelligence

1. A researcher is interested in whether students who attend private elementary schools do any better on s standard test of intelligence than the general population of elementary school children. A random sample of 75 students at a private elementary school is tested and has a mean intelligence test score of 103.5. The average for the general population of elementary school children is 100 (σ = 15).

Don't use plagiarized sources. Get Your Custom Essay on
Standard test of intelligence
Just from \$13/Page

a) Is this a one- or a two- tailed tests?

b) What are Ho and Ha for this study?

c) Compute zobt

d) What is zcv?

e) Should Ho be rejected? What should the researcher conclude?

f) Calculate the 95% confidence interval for the population mean, based on the sample mean.

2. Assume that the average person in America weights 150 pounds (μ). You want to determine whether colleges students weigh less than the average America, Following are the wights collected on a sample of colleges students: 120, 105, 166, 170, 145, 149, 135, 115, 168, 138.

a) Is this a one- or two-tailed test?

b) What are Ho and Ha for this study?

c) Compute tobt

d) What is tcv?

e) Should Ho be rejected? What should the researcher conclude?

3. How does a t test differ from a z test in terms of when it is used, how it is calculated, and how we determine significance?

4. According to the U.S. Bureau of the Census, 75% of adults regularly drank alcohol in 1985. An investigator predicts that fewer adults drink now than drank then. A sample of 100 adults is asked about their current drinking habits; 67 report drinking, and 33 report not drinking.

a) What is X2obt?

b) What is (are) the df for this test?

c) What is X2cv?

d) What conclusion should be drawn from these results?

5. A health magazine recently reported a study in which researchers claimed that iron supplements increased memory and problem-solving abilities in a random sample of college women. All of the women took memory and problem-solving tests at the beginning of the study, then took iron supplements, and then took the same tests again at the end of the study. What is wrong with this design? What confounds could be leading to the results of improved memory and problem-solving skills?

6. In an experimental study of the effects of exercise on stress, participants are randomly assigned to either the no exercise or the exercise conditions. Identify what type of study this is—between-, within-, or matched-participants. In addition, identify the independent and dependent variables and the control and experimental groups.

7. What are the advantages and disadvantages in the use of a posttest-only control group design versus a pretest-posttest control group design?

8. What is a confound and how is it related to interval validity?

9. What is the relationship between external validity and the college sophomore problem?

10. Explain what counterbalancing is, how it is achieved, and which confound it helps to minimize.

11. Explain what a Latin square is and how it helps with counterbalancing.

12. According to some research, males have better spatial skills than do females; and according to other research, females have better reading skills than males. A student is interested in determining which sex performs better on a word-search puzzle (a puzzle in which the words are hidden vertically, horizontally, and diagonally within an array of letters) since this type of puzzle involves both spatial and reading skills. A sample of males and females volunteer to participate and are given 10 minutes to work on a 50-word puzzle. The number of words correctly recognized is recorded for each subject, and the resulting data are as follows:

Males Females

12          15

8            12

9            11

11          18

10          13

12          14

7            17

Conduct the appropriate analysis of these data and determine whether there are any significant differences.

13. A college student is interested whether there is a difference between male and female students in the amount of time spending working out each week. The student gathers information from a random sample of male and female students on her campus. Amount of time spend working out is normally distributed. The data appear below.

Males Females

7         5

5         9

9         8

10       3

6         10

2          5

4          9

a) What statistical test should be used to analyze these data?

b) Identify Ho and Ha for this study.

c) Conduct the appropriate analysis.

d) Should Ho be rejected? What should the researcher conclude?

e) If significant compute the effect size and interpret this.

14. A student is interested in whether students who study with others devote as much attention to their studies as do students who study alone. He believes those who study alone devote more attention to their studies. He randomly assigns participants to either group or individual study conditions and has them read and study the same passage of information for the same amount of time. Participants are then given the same 10-item test on the material. Their scores appear below. Scores on the test represent interval/ratio data and are normally distributed.

Group Alone

6            10

5            9

6            7

5            7

6            6

6            6

7            8

8            6

5            9

a) What statistical test should be used to analyze these data?

b) Identify H0 and Ha for this study.

c) Conduct the appropriate analysis.

d) Should H0 be rejected? What should the researcher conclude?

e) If significant, compute the effect size and interpret this.

15. A researcher believes exercise reduces anxiety in women. She identifies a group of women who had not exercised before but are now planning to begin exercising. She gives them a 50-item anxiety inventory before they begin exercising and administers it again after 6 months of exercising. The anxiety inventory is measured on an interval scale and higher numbers indicate higher anxiety. In addition, scores on the inventory are normally distributed. The scores appear below.

Before After

Did you find apk for android? You can find new and apps.

# What Will You Get?

We provide professional writing services to help you score straight A’s by submitting custom written assignments that mirror your guidelines.

Get result-oriented writing and never worry about grades anymore. We follow the highest quality standards to make sure that you get perfect assignments.

#### Experienced Writers

Our writers have experience in dealing with papers of every educational level. You can surely rely on the expertise of our qualified professionals.

#### On-Time Delivery

Someone from our customer support team is always here to respond to your questions. So, hit us up if you have got any ambiguity or concern.

#### Complete Confidentiality

Sit back and relax while we help you out with writing your papers. We have an ultimate policy for keeping your personal and order-related details a secret.

#### Authentic Sources

We assure you that your document will be thoroughly checked for plagiarism and grammatical errors as we use highly authentic and licit sources.

#### Moneyback Guarantee

Still reluctant about placing an order? Our 100% Moneyback Guarantee backs you up on rare occasions where you aren’t satisfied with the writing.

#### Order Tracking

You don’t have to wait for an update for hours; you can track the progress of your order any time you want. We share the status after each step.

#### Areas of Expertise

Although you can leverage our expertise for any writing task, we have a knack for creating flawless papers for the following document types.

# Trusted Partner of 9650+ Students for Writing

From brainstorming your paper's outline to perfecting its grammar, we perform every step carefully to make your paper worthy of A grade.

##### Preferred Writer

Hire your preferred writer anytime. Simply specify if you want your preferred expert to write your paper and we’ll make that happen.

##### Grammar Check Report

Get an elaborate and authentic grammar check report with your work to have the grammar goodness sealed in your document.

##### One Page Summary

You can purchase this feature if you want our writers to sum up your paper in the form of a concise and well-articulated summary.

##### Plagiarism Report

You don’t have to worry about plagiarism anymore. Get a plagiarism report to certify the uniqueness of your work.

## Free Features \$66FREE

• Most Qualified Writer \$10FREE
• Plagiarism Scan Report \$10FREE
• Unlimited Revisions \$08FREE
• Paper Formatting \$05FREE
• Cover Page \$05FREE
• Referencing & Bibliography \$10FREE
• Dedicated User Area \$08FREE

#### Our Services

• On-time Delivery

We create perfect papers according to the guidelines.

##### Professional Editing

We seamlessly edit out errors from your papers.

Work with ultimate peace of mind because we ensure that your academic work is our responsibility and your grades are a top concern for us!

# Check Out Our Sample Work

Dedication. Quality. Commitment. Punctuality

# It May Not Be Much, but It’s Honest Work!

Here is what we have achieved so far. These numbers are evidence that we go the extra mile to make your college journey successful.

# Process as Fine as Brewed Coffee

We have the most intuitive and minimalistic process so that you can easily place an order. Just follow a few steps to unlock success.

# See How We Helped 9000+ Students Achieve Success

#### We Analyze Your Problem and Offer Customized Writing

We understand your guidelines first before delivering any writing service. You can discuss your writing needs and we will have them evaluated by our dedicated team.

• Clear elicitation of your requirements.
• Customized writing as per your needs.

#### We Mirror Your Guidelines to Deliver Quality Services

We write your papers in a standardized way. We complete your work in such a way that it turns out to be a perfect description of your guidelines.

• Proactive analysis of your writing.
• Active communication to understand requirements.