What is the difference between a standard deviation and a standard error?

Which type of data display is most appropriate to use with the above 5-number summary?

A meteorologist has predicted a 30% chance of rain on each of the first 8 days during this past month. Use the binomial distribution to determine the probability that it actually rained on at least one of these 8 days.

True or False: If we have an upper-tail test with and , the appropriate decision is to REJECT the null hypothesis.

Use this set-up for Problems 32-34: Amelia, Brian, Caitlin, and Drew have each taken a random sample of people from their classes to estimate the variability in the amount of money spent on entertainment during the past month. Amelia asked 10 people, Brian asked 30 people, Caitlin asked 50 people, and Drew asked 70 people. Whose sample standard deviation has the potential to differ the most from the population standard deviation? (Hint: Think about how a larger/smaller sample size affects the accuracy of a point-estimate.)

A more in-depth follow-up questionnaire is to be distributed to a sample of these 240 students. Which of the following best describes how to find a systematic random sample containing 24 students?

Compute Q3 and explain what it represents.

Suppose you roll this weighted die twice. What is the probability that you roll a 4 followed by a 6?

To decrease the standard error, what could you choose to do?

Is it in your best interest to pay the parking meter? (Compare the expected value of not paying the parking meter to actually paying for the cost of parking for 1 hour.)