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A random sample of 121 automobiles traveling on an interstate showed an average speed of 65 mph. From past information, it is known that the standard deviation of the population is 22 mph. Determine a 96.6% confidence interval for the mean.
Statistics and Probability, Statistics
Two candidates face each other in an election. The Democratic candidate is supported by 58% of the population, and the Republican candidate is supported by 42%. In other words, if you randomly chose a voter and asked the ...
In a fish tank, there are 23 goldfish, 4 angelfish, and 9 guppies. If a fish is selected at random, find the probability that it is an angelfish or a guppy.?
1. What is the standard deviation of the sampling distribution? 2. What is the expected value? 3. What is the probability that the average life in the sample will be between 2,670.56 and 2,809.76 hours? 4. What is the pr ...
Assume that 50 percent of the students at the university have taken 4 years of high school math. Of those with four years of high school math, 80 percent plan to major in science. Of those without 4 years, only 20 percen ...
The standard deviation of the market-index portfolio is 45%. Stock A has a beta of 1.20 and a residual standard deviation of 55%. a-1. Calculate the total variance of stock A if its beta is increased by 0.20? (Do not ro ...
The number of phone calls that arrive at a phone exchange is often modeled as a Poisson random variable. Assume that on average there are 7 calls per hour. Show all work. a) Find the probability that there are exactly f ...
Determine the critical? value(s) for a? left-tailed test of a population mean at the alpha α=0.01 level of significance based on a sample size of n=15.
The equation used to predict how long a cold will last is y=-1.8 + 0.09x1 + 3.2x2 - 1.9x3, where x1 is person's temperature on the first day, x2 is number of people seen each day, and x3 is the amount of sleep the person ...
In a survey of 2936 adults, 1431 say they have started paying bills online in the last year. Construct a 99% confidence interval for the population proportion. A 99% confidence interval for the population proportion is ( ...
The researchers stated that there were no significant differences in the baseline characteristics of the intervention and control groups. Are these groups heterogeneous or homogeneous at the beginning of the study? Why i ...
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Why might a bank avoid the use of interest rate swaps, even when the institution is exposed to significant interest rate
Describe the difference between zero coupon bonds and coupon bonds. Under what conditions will a coupon bond sell at a p
Compute the present value of an annuity of $ 880 per year for 16 years, given a discount rate of 6 percent per annum. As
Compute the present value of an $1,150 payment made in ten years when the discount rate is 12 percent. (Do not round int
Compute the present value of an annuity of $ 699 per year for 19 years, given a discount rate of 6 percent per annum. As