Psych stats exam 2

A researcher selects a sample of 121 participants From a population with a mean of 32 and a standard deviation of 22 what is the standard error of mean

2.0

The probability of a type 1 error is stated by And the probability for committing a type 11 error is stated by

Alpha Beta

Which of the following is not one of the four steps to Hypothesis testing

Identify hypothetical data

A researcher believes that increasing attention given to children Will improve mean academic performance therefore the alternative hypothesis would be

Mean academic performance will increase

A researcher selects a sample of 36 students from a school population with a mean IQ of 100 and a standard deviation of 12 she determines that the mean IQ in this sample is 104 assuming she computes a one sample Z test at a .05 level of significance what is the decision for a two tailed test

Reject the null hypothesis; IQ scores in this sample are significantly higher than those in the population.

Suppose a researcher wants to make sure that the probability of committing a type 1 error is less than 5% how can the researcher control for this

Set the alpha level at .05

Which of the following statements regarding the null hypothesis is true

The null hypothesis always makes statements about a population parameter.

A researcher obtains z=-6.45. What is the decision for a one tailed test upper tail critical at a .05 Level of significance

To retain the null hypothesis

If the value of a test statistic is in the rejection region then

all of the above

As sample size increases the standard error of the mean

decreases

The mean of sampling distribution of sample means is

equal to the population mean

Which type of sampling is most Often applied by researchers In the behavioral sciences

experimental sampling

In a normal distribution 50% of all data

fall above the mean fall below the median fall above and below the mode

The normal distribution is symmetrical which means that

scores above the mean are distributed the same as scores below the mean

Hypothesis testing is also called

significance testing

Experimental research is typically conducted using a sampling strategy in which

the same participant can never be selected twice in the same sample

The normal distribution has all the following characteristics except

the total area under the curve is greater than 1.0

A professor gives an exam in which the mean score is 78 points She gives another exam to test whether or not the scores change in this example the null hypothesis is

μ = 78