We know that the mean score on a common measure of impulsivity is 20 points. A psychologist believes that the patients in her clinic are significantly different than the average in terms of their impulsivity. She implements impulsivity scale with 30 of her clinic patients and finds the following descriptive statistics: mean = 24.1, variance = 23.717 Do the patients in this sample have significantly different impulsivity scores than the human population average?

1. Identify the populations and state the null and research hypotheses. 1 : ?, 2 : ?, H0: ?, H1: ?
2. State the df and your critical t, based on a p-level of 0.05.
3. Calculate (and report) the t statistic.
4. State your decision and interpret the result. Describe the results in APA format.
5. Calculate the 95% confidence interval for the true population mean.
6. Calculate Cohen's d as a measure of effect size and describe the size of the effect.
7. Below is the actual data set. Use JASP to perform a 1-Sample t-test and check your answers. Copy and paste your JASP output table into your assignment for #20.

Data: 27, 18, 17, 24, 20, 19, 21, 22, 20, 20, 25, 32, 22, 30, 28, 24, 18, 35, 24, 31, 22, 32, 22, 25, 29, 22, 16, 26, 25, 27