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