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Point charges +4.00 μC and +2.00 μC are placed at the opposite corners of a rectangle as shown in the figure. What is the potential at point A, relative to infinity, due to these charges? (k = 1/4πε0 = 9 x 109 N. m2/C2)  

In a random sample of 15 students enrolled in online sections of STAT 200 in the summer 2017 semester the mean midterm exam score was 

A randomization test was conducted to compare to proportions:   The difference between the two sample proportions was [dif].  From the randomization plot we can see that this is a [ta] tailed test.  The p-value is [p]. We should [hy] the null hypothesis. 

In a random sample of 15 students enrolled in online sections of STAT 200 in the summer 2017 semester the mean midterm exam score was 

In the population of all citizens of Turkey, the median age is 30.2 years. This value is a [type]. Age (in years) is a [variable] variable. 

In the population of all University Park STAT 200 students in the Spring 2016 semester the mean final exam score was 78.542 points.    The value of 78.542 points is a [type]. Final exam scores are a [variable] variable.

There are [n] students enrolled in one large introductory statistics course. Of those [n] students, [x] students are psychology majors. Compute the proportion of students enrolled in this course who are psychology majors. Round your final answer to three decimal places. 

Research question: Is the mean score in the population different from 90 points?   H0: μ = 90Ha: μ ≠ 90   The hypotheses above were tested using data from a random sample. Descriptive statistics are presented in the following table:   Descriptive Statistics N Mean StDev [n] [xbar] [stdev]   Compute Cohen’s d for the difference between the observed sample mean and hypothesized population mean. Round your final answer to three decimal places. 

Complete the following statement: Confidence intervals and hypothesis testing are examples of 

H0: p = 0.5 Ha: p ≠ 0.5 The hypotheses above were testing using the following sample data. Descriptive Statistics N Event Sample p 95% CI for p 30 18 0.600 (0.406, 0.773)   The result was a p value of 0.362, so the researchers had to fail to reject the null hypothesis at the 0.05 alpha level.  Which of the following changes would result in a smaller p value?