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The P-value for testing the hypoteheses, H0: ? = 30 versus HA: ? > 30, is 0.032. Does the 95% confidence interval for ? include the value 30?
A survey from Teenage research Unlimited found that 30% of teenage consumers receive their spending money from part-time jobs. If 5 teenagers are selected at random, find the probability that exactl
Suppose you have a bag of 150 marbles; 52 are all red 23 are all green, 40 are all blue, 9 are red and green, 14 are green and blue and 12 are red and blue. Without looking, you draw one marble from
What is the standardized score of a mean of 230 taken from a sample of 25 from a normal population that has a mean of 211 and standard deviation equal to 46?
The mass of a species of shrew is approximately normally distributed with a mean of 10 grams and a standard deviation of 5 grams, then (no continuity correction)
Find the mean and standard error of the sample means that is normally distributed with a mean of 10 and a standard deviation of 2 and a sample size of 25.
Suppose you were given the task of estimating the proportion of drivers in Troy, AL who text while they drive. Discuss what factors you must consider and how you would accomplish this.
The amounts of soft drink machine is designed to dispense for each drink are normally distributed, with a mean of 11.7 fluid ounces and a standard deviation of 0.3 fluid ounce. A drink is randomly s
The mean gross annual incomes of certified welders are normally distributed with the mean of $20,000 and a standard deviation of $2,000. The ship building association wishes to find out whether thei
Calculate the probability that at least 12 in a sample of 20 first-time buyers would take out no-money-down loans if San Francisco's proportion is the same as the nationwide proportion of no-money-d
Suppose that a population is known to be normally distributed with mean = 2,000 and standard deviation = 230. If a random sample of size n = 8 is selected, calculate the probability that the sample
A resercher wishes to estimate, with 90% confidence, the proportion of adults who have high-speed internet access. Her estimate must be accurate within 4% of the true proportion.
A randomly selected value from a normal distribution is found to be 2.1 standard deviations above its mean. What is the probability that a randomly selected value from the distribution will be great
A distribution center receives shipments of a product from three different factories in the quantities of 60,40, and 20. Three times a product is selected at random, each time without replacement. F
Determine the minimum sample size required to construct a 99% confidence interval using a population standard deviation of 0.25 in. Repart a using a standard deviation of 0.30 in. Which standard dev
Change the sample size to n=80. Construct a 90% confidence interval for the population mean repai cost. Which confidence interval is wider. Explain
Edward's hometown, Forks, Washington is usually very cloudy and rainy, but lately it has been very sunny with an 80% chance that it will be sunny each day for the foreseeable future. Assume that the
An American roulette wheel has 38 slots: 18 are red, 18 are black and 2 are green. Let R be the number of spins until you observe red. Let B be the number of spins until you observe black. Let G be
A shipment of 250 netbooks contains 3 defective units. Determine how many ways a vending company can buy three of these units and receive:
You are picking a bouquet of 20 flowers for your mother at random from a garden with 25 coneflowers, 35 daisies and 42 lilies. Your mother likes daisies the best and you want to have 15 of those in
A particular competitor hits the target 90% of the time while lying down if it is not windy, but only 80 % of the time if it is windy. It is windy 40 % of the time. What is the probability that it w
Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test). Find the probability that a randomly selected adult has a
The wolf pack needs to kill 3 large animals in order to feed the whole pack. What is the probability that it will need to chase 20 large animals to feed the pack?