# PSY 1110 A health care professional wants to determine

March 14, 2016

Question
A health care professional wants to determine whether individuals with hypertension who take Atenolol have significantly lower systolic blood pressure than individuals with hypertension who do not take Atenolol. For individuals who have not been prescribed Atenolol, the population systolic blood pressure mean is 145 (µ = 145). The 30 individuals who take Atenolol have an average systolic blood pressure of 177, with a sample standard deviation of 26. On the basis of these data, can the researcher conclude that the Atenolol significantly lowers systolic blood pressure? (Use these numbers only for this question!)

Calculate the 95% confidence interval

As you know, two values will be required to complete the following equation:

_________ ? µ ? __________

For this question, what is the value that is below or less than µ?

Question 32

A health care professional wants to determine whether individuals with hypertension who take Atenolol have significantly lower systolic blood pressure than individuals with hypertension who do not take Atenolol. For individuals who have not been prescribed Atenolol, the population systolic blood pressure mean is 144 (µ = 144). The 30 individuals who take Atenolol have an average systolic blood pressure of 162, with a sample standard deviation of 8. On the basis of these data, can the researcher conclude that the Atenolol significantly lowers systolic blood pressure? (Use these numbers only for this question!)

Calculate the 95% confidence interval

As you know, two values will be required to complete the following equation:

_________ ? µ ? __________

For this question, what is the value that is above or greater than µ?

Question 33

The average time scheduled for a doctor’s visit is 10 minutes with a standard deviation of 21 minutes. A researcher uses a sampling distribution made up of samples of size 279. (Use these numbers for this question only!)
According to the Central Limit Theorem, what is the standard error of the mean?

Question 34

The average time scheduled for a doctor’s visit is 40 minutes with a standard deviation of 20 minutes. A researcher uses a sampling distribution made up of samples of size 85. (Use these numbers for this question only!)
According to the Central Limit Theorem, what is the mean of the sampling distribution of means?

Question 35

Which of the following is most likely to increase the calculated value of a t-test?

Increase the number of subjects

Decrease the number of subjects

Repeat with a convenience sample

Repeat with the same sample

Question 36

As you increase the true distance between the null and alternative hypotheses, the likelihood of rejecting the null hypothesis

Increase

Decrease

Remains the same

Question 37

Keeping everything else the same, if you were to change your alpha level from .01 to .05, the likelihood of rejecting the null hypothesis

Increase

Decrease

Remains the same

Question 38

In a research setting, it is more common to use t-tests than z-tests because

Typically the population mean is unknown.

Typically the population standard deviation is unknown

They are more accurate since sample size is taken into account when determining critical values

Typically the sample mean is unknown.

“t” comes before “z” in the alphabet

Question 39

What is the basic question that underlies hypothesis testing?

Is the sample representative of the population?

Could the relationship observed in the sample have occurred by chance?

What is the standard score?

Should we reject the null hypothesis?

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