A researcher measures the time (in seconds) it takes a sample of 26 participants to respond to a stimulus presented on a computer screen. The standard deviation for response times is 6.  What is the value for SS?

I’ve already posted this one, but I’m posting it again, because I need to be shown what to input into my TI-84 Plus calculator to solve.

Write the formulae  60% of all the students passed an exam. If a random sample of 10 students is selected, What is the mean and the standard deviation ?

A person scores 81 on a test of verbal ability and 6.4 on a test of quantitative ability. For the verbal ability test, the mean for people in general is 50 and the standard deviation is 20. For the quantitative ability test, the mean for people in general is 0 and the standard deviation is 5. Which is this person’s stronger ability: verbal or quantitative? Explain your answer to a person who has never had a course in statistics.

Students in a class took a test whose results were normally distributed.  The mean score was an 81 and the standard deviation was 4.5.  What score is at the 83rd percentile (round to the nearest whole number.) a.84 b.83 c.85 d.86

The mean value in a dataset is 100, and the value of one standard deviation is 20. What is the value c a piece of data is 2.5 SDs above the mean? Type your answer...

You are given the following information:  sample mean is equal to 103.55, population standard deviation is equal to 14.88, sample size is equal to 111 and the national average is equal to 109.  What would be the value of z-observed?

Given a scenario where n=100 and p=0.8, find the mean.

Can you please assist ?