Bell-shaped distribution with a mean
Data with 250 observations are drawn from a bell-shaped distribution with a mean of 50 and a standard deviation of 12. Approximately how many observations are more than 74?
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A study is conducted to estimate the association between exposure to lead paint in childhood and attention deficit hyperactivty disorder (ADHD). Data on n=400 children are collected, and data on exposure and ADHD diagnosis are shown in Table 9-26.
The PIRON Software Company currently develops marketing software for primarily service-based organizations. They are considering expanding their operations to product marketing in the Phoenix area.
Based on the certain data, a null hypothesis is rejected at the 0.05 level of significance. would it also be rejected at the
In the test of a certain hypothesis, the P-value corresponding to the test statistic is 0.0316. Can the null hypothesis be rejected at the
This is another example of regression to the mean: students who do well on the midterm will on average do less well, but still above average, on the final.
Mars states that the population proportion of blue M&Ms is .240. When approximating the binomial distribution as NORMAL, what is the probability of calculating a sample proportion of .237 or less blue M&Ms from a sample size of n = 70?
The average length of stay at a local hospital is 4.9 days. Assuming a population standard deviation of 3.5 days, what is the probability a random sample of 50 patients has an average stay of 5.2 days or less?
In an application to estimate the mean number of miles that employees commute to work roundtrip each day, the following information is given: n = 20; sample mean = 4.33; sample standard deviation of s = 3.50 miles.
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