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Age and Weight
The scatterplot shows the age and weight for some women. Some of them exercised regularly, and some did not.
Explain what it means that the blue line (for those who did not exercise) is a bit steeper than the red line (for those who did exercise).
What three rules govern the construction of a grouped frequency distribution?- What is the difference between a histogram and a bar graph?
Excited by the recent warm weather Jill and Kelly are doing spring cleaning at their apartment. Jill takes an exponentially distributed amount of time.
A high percentage of people who fracture or dislocate a bone see a doctor for that condition. Suppose the percentage is 99%.
Describe briefly the design of a blind matched pairs experiment to investigate this question. How will you use randomization?
Geometric or not? Determine whether each of the following scenarios describes a geometric setting. If so, define an appropriate geometric random variable.
Suppose you have drawn a simple random sample of 400 business executives. In this sample, 150 executives owned Blackberries.
In each of the following cases, decide whether or not a binomial distribution is an appropriate model, and give your reasons.
National average for 2-year leases is 30,000 miles. Select the suitable hypothesis.
A gamble is said to be fair if each player has the same expected outcome. Suppose we play a game in which the first of two players receives $50 each time.
Imagine that a researcher measured a group of participants at two time points. Fictional scores for these two time points appear below. Are the scores different at time 1 and time 2?
A jar contains black and white marbles. Two marbles are chosen without replacement. If the probability of selecting a black marble and a white marble is 0.34, and the probability of selecting a black marble on the first draw is 0.47,
Design an experiment using a staged manipulation to test the hypothesis that when people are in a good mood, they are more likely to contribute to a charitable cause. Include a manipulation check in your design.
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