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The standard deviation of the population is 70 books per professor. An anthropologist wishes to find the 99% confidence interval for the mean number of books each professor has. How many professors must the anthropologist sample to obtain an average accurate to within 14 books per professor?
The average gasoline price of one of the major oil companies in Europe has been $1.25 per liter. Recently, the company has undertaken several efficiency measures in order to reduce prices.
The probability of an randomly selected person quits a team is 0.125. Assume the team has n members. Determine the smallest n that the team needs to have if the probability of the team has at least 20 members left is 0.9.
Can the formal hypothesis testing approach be used for non parametric tests? How are parametric and nonparametric statistics different?
Assume if the students toss the coin 200 times each about 68% should have proportions among what two numbers.
A corporate executive officer is attempting to arrange a meeting of his three vice presidents for tomorrow morning. He believes that each of these three busy persons, independently of the others
Assume 1.5% of antennas on new Nokia cell phones are imperfect. For random sample of 200 antennas, determine the probability that: None of the antennas is defective.
If the standard deviation is $89.46, find the probability that a randomly selected customer spends between $550.67 and $836.94.
Truck tire life is normally distributed with a mean of 60,000 miles and a standard deviation of 4,000 miles. You bought four tires. What is the probability that the average mileage of the four tires exceeds 66,000 miles?
The trial failed to show significance. How many subjects would be required to detect the difference in proportions observed in the trial with 80% power?
Choose an article that explains research using one or more statistical tests (z, t, ANOVA, chi square, regression) as part of data analysis. Explain the study using the following information:
A large bakery buys flour in 25-pound bags. The bakery uses an average of 4,860 bags a year. Preparing an order and receiving a shipment of flour involves a cost of $10 per order. Annual carrying costs are $75 per bag.
Would the null hypothesis be accepted or rejected in this case?
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