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Serum cholesterol levels were taken from a population of 10,000 college students. The results were normally distributed. Males had a mean of 195 and a standard deviation of 10. Females had a mean of 185 and a standard deviation of 12.
Concern was expressed by the health educators that students with serum cholesterol levels above 200 might be at an increased risk of heart disease. If the campus was equally divided between males and females, how many students would be at increased risk?
What is the portion of students obtaining scores between 85 and 95 and what is the score needed to be at the top 10% of the class and what is the probability that the value of the portfolio is greater than $2,000?
What is the probability that an individual will be a salaried employee whose intrinsic satisfaction value is 5 or more?
Develop a probability tree showing all marginal, conditional, and joint probabilities and what is the probability that a student selected at random failed the test?
Births with gestation time of 258 days or less are regarded to be premature births. Determine the probability that randomly selected pregnant woman will give birth to premature baby?
In a random sample of 400 employees of a local company, 180 were female. At 95% confidence using the critical value approach, determine if the proportion of females in the company is significantly less than 50%.
If you select a random sample of 16 customers: what is the probability that the mean time spent per customer is at least 3 minutes?
With a selling price of 40 dollars each, how many pool cues must be sold to break even? What would the total revenue be at this break even point?
If the sample mean is 15.2 oz. and the sample standard deviation is 0.40 oz., find the 95% confidence interval of the true mean.
Determine the standard error of estimate. Suppose a large sample is selected (instead of just five). About 68 percent of the predictions would be between what two values?
Suppose you are working with a data set that is normally distributed, with a mean of 300 and a standard deviation of 44. Determine the value of x from the following information.
Average time it takes males to complete a baccalaureate degree in the California public university system. Using the summary data below from the two samples, compute the value of the test statistic t*.
We assume that the population is approximately normally distributed. Find the confidence interval: for a confidence level of 95%:
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