# stats

posted by .

Which test should be used one samples t test, independent samples t test or dependent samples t test
You may have heard that eating salt can influence people’s weight. Assume that the normal weight of 20-year-old females is 150 pounds. You obtain a sample of 20-year-old females (N = 12) who consumed salty foods and record their weight. determine whether salt intake affects weight.

• stats -

This is a one sample test. It is one sample because you aren't comparing groups, etc.

• stats -

Here's the rest of the data
155 160 150 145 200 155
190 140 170 175 142 168

• stats -

So I will have to find the mean and standard deviation of the sample.

Then how will I set up the hypothesis to begin running the test

• stats -

Ho: Mu = 150
Ha: Mu >150

some books set up Ho: as Mu is less than or equal to because the go in the opposite direction of the Ha.

The Ho always includes the =

You are testing to see if your mean is significantly different from the known 150.

When you do the test you will compare your outcome to a given significance level. Usually it is 10% or 5% or 1%

Also written as .10, .05, .01

• stats -

So I have the mean as 162.5 and standard deviation 18.86

standard error =s/square root n =18.86/12= 5.44

t=m-mean/standard error = 150-162.5/5.44= -2.29

So we fail to reject Ho

• stats -

You have to compare the -2.29 either with the significance level of say .05

You will go to a t-table look up the -2.29 with the correct degrees of freedom and compare that value with the .05. If it is less then you reject, if it is more you fail to reject.

Another way would be to go to the t-table. use .05 in the body and the correct degrees of freedom. You will find a t-value and you compare it to -2.29

You will get a positive number from the t-table, but you are talking about the lower tail, so you want it to be negative.

If the -2.29 is farther out in the tail than the t-value then you reject HO.

• stats -

yes I used it against the alpha level .05 of the z score +/- 1.96 so I reject because it is less than stating that those who consumed salty foods didn't have an significant impact on whether the intake of salt affects weight

## Similar Questions

1. ### stats

Which test should be used one samples t test, independent samples t test or dependent samples t test You may have heard that eating salt can influence people’s weight. Assume that the normal weight of 20-year-old females is 150 pounds. …
2. ### Stats help

Which test should be used one samples t test, independent samples t test or dependent samples t test. What do you set the hypothesis as Five people who were convicted of speeding were ordered by the court to attend a workshop. A special …
3. ### Application: Two-Sample t-Tests

Should Martha use an independent-samples t-test or a related samples t-test?
4. ### Statistics

1. z test 2. t test for independent samples, and 3. t test for dependent samples Hi! I really need help with this statistics. Its just that you suggest one psychological research question that could be answered by each of the following …
5. ### Statistics Help !!

Are my answers here correct ? Research questions for z test, t test for independent samples and t test for dependent samples : z test: "An investigator is interested in finding out whether the particular sample of college students
6. ### Statistics

Are my answers here correct ? Research questions for z test, t test for independent samples and t test for dependent samples : z test: "An investigator is interested in finding out whether the particular sample of college students
7. ### Statistics Help !!!!

Are my answers here correct ? Research questions for z test, t test for independent samples and t test for dependent samples : z test: "An investigator is interested in finding out whether the particular sample of college students
8. ### Psy

Suggest one psychological research question that could be answered by each of the following types of statistical tests: •z test •t test for independent samples, and •t test for dependent samples
9. ### statistics

A credit card company estimates that the average credit card balance of Americans is \$3,210. A statistics student wants to know whether this is true for citizens of her home town. Which hypothesis test would be most appropriate for …
10. ### PsychologicaStatistics

Suggest one psychological research question that could be answered by each of the following types of statistical tests: z test t test for independent samples, and t test for dependent samples

More Similar Questions