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Four buses carrying 160 high school students arrive to Montreal. The buses carry, respectively, 34, 48, 29, and 49 students. One of the studetns is randomly selected. Let X denote the number of students that were on the bus carrying this randomly selected student. One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on his bus. Compute the expectations and variances of X and Y.
According to the regional bar assoc., 60% of people who take the bar exam pass. Find the approximate probability that at least 61% of 200 randomly selected people taking the bar will pass. Round to three decimal places as needed.
The sample mean is 50, the t-critical value is 1.96, and the standard error of the sample mean is 2.
The athletic director claims that the atendance is the same as last year. What is the test value needed to evaluate the claim?
Before 1918, in a random sample of 11 wolves spotted in the region, what is the probability that 8 or more were male?
Chocolate chip cookies resulted in the following calorie amounts. At the a _ 0.01 level, is there sufficient evidence that the average calorie content is greater than 110 calories?
A medical researcher is interested in whether patient's left arms or right arms are longer. if 14 patients participate in this study (so that n left arms and n right arms are measured), how many degrees of freedom should the researcher use in her ..
A brand name has a 60% recognition rate. If the owner of the brand wants to verify that rate by beginning with a small sample of 10 randomly selected consumers, find the probability that exactly 6 of the 10 consumers recognize the brand name.
Conclude that the population average pulse rate is 71.8. Reject the hypothesis that the population average pulse rate is 70.
Does lovastatin reduce the risk of heart attack? Researchers gave lovastatin to 2,325 people and an placebo to 2,081 people. the average age of both groups in 58 years.
The sample size n , the sample means, and the sample standard deviations for the two groups are given below.
Students will conduct one brief research exercise that will be written up as a research report using APA style.
Mean of $32,000 and a standad deviation of $3000. If 100 teachers are randomly selected, find the probability that their mean salary is greater than $32,500.
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