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Is this sample sufficient to conclude that the eye-spots have a significant influence on the birds? behavior? Use a two- tailed test with α = .05.
Suppose you have a normal distribution of 101 numbers with a mean of 4.50 and standard deviation of 2.50. What would you expect the median to be?
Suppose that the heights of adult men in the United States are normally distributed with a mean of inches and a standard deviation of inches. What proportion of the adult men in United States are mo
Briefly describe how the standard deviation influences the outcome of the hypothesis test. How does σ influence measures of effect size?
If writing scores for the population have a standard deviation of σ = 20, does the sample provide enough evidence to conclude that the new composition course has a significant effect?
Find the z-score boundaries that separate a normal distribution as described in each of the following:
A company produces two sizes of wallets from a material. The first requires 60 sq. inches of material and the second requires 100 square inches. The company has 1,000 sq. feet of material. what is t
Among 13 adults randomly selected from this area, only 3 reported that their health was excellent. Find the probability that when 13 adults are randomly selected, 3 or fewer are in excellent health.
A school only accepts students with the top 20% of sat scores. the sat has a mean of 500 and a standard deviation of 100. what actual score should be used as the cut-off score?
A random sample of 72 graduate students generated the following 90% confidence interval: (0.438, 0.642). Based on the interval above, is the population proportion of females equal to 0.60?
If the sample consits of 16 scores, is the sample mean sufficient to conclude that the treatment has a significant effect? use a two tailed test with .05
A recent poll states that 40% of all American adults are overweight. If 3 adults are selected at random, what is the probability (correct to 3 decimal places) that at least one adult is overweight?
What is the probability that (a) both will fail? (b) Neither will fail? (c) One or the other will fail? Show all steps carefully.
A new phone system was installed last year to help reduce the expense of personal calls that were being made by employees. Before the new system was installed, the amount being spent on personal cal
The National Association of Realtors estimates that 23% of all homes purchased in 2004 were considered investment properties. If a sample of 800 homes sold in 2004 is obtained what is the probabilit
The number of gallons of paint that Home Depot sells in a given day is normally distributed. what is the probability that the average number of gallons sold will be 193 or less?
The owner of a computer repair shop has determined that their daily revenue has mean $7200 and deviation $1200. The daily revenue totals for the next 30 days will be monitored. What is the probabili
The amount of flour used per day by a bakery is a random variable Y that has an exponential distribution with mean equal to 4 tons. Find the probability density function for U.
The average return was 11 percent with a standard deviation of 12 percent. What is the upper bound of the 99% confidence interval?
Suppose that all stocks had the same distribution of returns. What return must a stock have such that it is higher than 90% of all other stocks?
Find the probability that at most 5 defective bolts will be found in a box of 200 bolts if it is known that 2 per cent of such bolts are expected to be defective .(you may take the distribution to b
What percentage of the transmission will be good for more than 100,000 mile ?
A 15% chance the portfolio return is 9%, and otherwise, the portfolio return will be 16%. What is the expected return on the portfolio?
Can we calculate that the mean weight produced by the machine has increased? Use 5% level of significance.
If 280 different quarters are inserted into the vending machine, what is the expected number of rejected quarters?