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1. A survey was conducted to measure the height of men. In the survey, respondents were grouped by age. In the 20-29 age group, the heights were normally distrivuted with a mean of 67.6 inches and a standard deviation of 4.0 inches. A study participant is randomly selected,
Find the probability that the study participant is between 65 and 70 inches tall. (Round to four decimal places)
2. In a recent year, scores on a standardized test for high school students with a 3.50 to 4.00 gpa were normally distributed, with a mean of 37.9 and a standard deviation of 2.1. A student with a 3.50 to 4.00 gpa who took the test is randomly selected.
The probability of a student scoring between 35.1 and 40.7 is? (Round to four decimal places.)
a student wanted to construct a 95 confidence interval for the average age of students in her statistics class. she
What is the probability of a fatal accident over a lifetime? Explain your reasoning carefully. Hint: Assume independent events. Why might the assumption of independence be violated?
the theorem that states that the sampling distribution of the sample mean is approximetly normal when the sample size n
the economic policy institute periodically issues reports on wages of entry level workers. the institute reported that
The margin of error for polling results is typically determined as the half-width of a 95% confidence interval. With respect to a particular ballot proposition
The president of the American Insurance Institute wants to compare the yearly costs of auto insurance offered by two leading companies.
From a practical point of view, what is the difference between the frequency distribution and relative frequency distribution? Why is a cumulative relative frequency distribution so much more informative that just the relative frequency distributi..
Perform a significance test to assess whether there is an association between mortality from cirrhosis of the liver and duration of employment in the group hired after 1945. Report a p- value.
Assume that the standard deviation of college student IQ's is 10. A random sample of 100 students from a college showed an average IQ of 110. Compute a 95% confidence interval for the mean IQ of students attending this college.
In order to test to see if there is any significant difference in the mean number of units produced per week by each of three production methods, the following data were collected:
Find the standard error of the mean Also establish an interval estimate around the sample mean using one standard deviation of the mean.
Assume a steady smoker spends on average $20 with a standard deviation of $5 per week on cigarettes. What is the probability that a sample of 100 steady smokers spend between $19.50 and $21?
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