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A mean score on a standardized test is 50 with a standard deviation of 10. Answer the following:
a) What scores fall between -1 and +1 standard deviation?
b) What percent of all scores fall between -1 and +1 standard deviation?
c) What score falls at +2 standard deviations?
d) What percentage of scores falls between +1 and +2 standard deviations?
What was the highest score earned on the exam? According to Chebyshev's Theorem, how many students scored between 42 and 74?
Psychologists once measured 77 variables on a sample of schizophrenic people and a sample of people who were not schizophrenic. They compared the two samples using 77 separate significance tests.
A TV executive is interested in the popularity of a particular cable TV show. She has been told that a whopping 68% of American households would be interested in tuning in to a new network version of the show.
Carry out a t-test to see if the mean healing rate is significantly lower in the experimental limbs, including all 12 newts. What are the test statistics and their P-values?
Time to help a stranger was investigated by a group of undergraduate psychology majors as a part of their Introduction to Research Methods course.
Which of the following assumptions is not made for the F-test for comparing three or more means?
Do these results suggest that the different therapies have different effects on mental health? (Use the .05 level.) a. Use the five steps of hypothesis testing.
Event A occurs with probability 0.2. Event B occurs with probability 0.3. Event C occurs with probability 0.4. If A, B, and C are disjoint, then
Spinning a coin, unlike tossing it, may not give heads and tails equal probabilities. I spun a penny 200 times and got 83 heads. How significant is this evidence against equal probabilities?
Using the confidence interval when conducting a two-tail test for the population mean we do not reject the null hypothesis if the hypothesized value for:
Find out the probability distribution, and the cumulative probability distribution of car arrivals.
Develop a joint probability table for these data and use the table to answer the remaining questions. What do the marginal probabilities tell you about the age of the US population?
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