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Assume that SAT-math scores are normally distributed with mean 500 points and standard deviation 100 points. Jordan scored 750 on the SAT-math test.  Jordan’s standardized score (z-score) is ? 95% of the SAT-math scores would lie between

A news reporter writes an article with the headline “Caffeine makes cyclists faster”. The article says that 30 cyclists were recruited to research the effect of caffeine on physical performance. Each cyclist was randomly assigned to take either a placebo or a caffeine pill before their next timed ten mile ride. The following week the cyclists returned, took the other kind of pill, and were timed again on the same ten mile ride. The researcher found that on average the cyclists rode faster after taking the caffeine pill. Is the headline written for the article an accurate summary of the researcher’s results?

Researchers want to see if men have a higher blood pressure than women do. A study is planned in which the systolic blood pressures of 50 men and 50 women will be measured (in mm Hg). The appropriate alternative hypothesis about the means of the men and women is .  This is a test

A mind reading experiment is done in which a subject tries to correctly identify which of 4 cards the researcher has randomly picked, where each card is equally likely. This is repeated for 200 trials. The null hypothesis is that the subject is guessing at random, while the alternative is that the subject can read minds and can guess the card selected at a rate higher than guessing at random. The subject actually gets 70 correct answers. Which of the following describes the probability represented by the p-value for this test? The probability of getting 70 or correct, if the subject . 

A study was conducted to compare female and male college students based on the number of hours they spend watching television on weekends. Results are summarized below. Female group mean = 4.52Male group mean = 4.89Standard error for the difference the two sample means = 0.11 With the difference in population means defined as “Female minus Male” which of the following presents the correct test statistic?

You conduct an analysis comparing two online textbook stores on the prices they charge (in dollars) for new books. You sample 40 textbooks and obtain the price for each textbook at each online textbook store.  Below are the results. Sample mean of the paired differences = 8 Standard deviation of the paired differences = 15 Standard error for the mean of the paired differences = 2.37Which of the following is the correct test statistic for this analysis?

Does burning areas of an ecosystem improve the performance of native grasses? A team of ecologists tested this on 50 fields. Assume the researchers performed an experiment and calculated a p-value of 0.024.  Complete the statements below: Using a significance level of 0.05, the researchers should the null hypothesis. It is possible that they have committed a type error.

In a survey, students are asked how many hours they study in a typical week. A five-number summary of the responses is included.    Min Q1 Med Q3 Max 5 9 14 20 50   Use the information from this five-number summary to identify the quantities listed below.

Assume that SAT-math scores are normally distributed with mean 500 points and standard deviation 100 points. Taylor scored 650 on the SAT-math test.  Taylor’s standardized score (z-score) is ? 95% of the SAT-math scores would lie between