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For a random sample of 35 items, a known population standard deviation of 23, and a sample mean of 211 estimate the:
a. the population mean with a confidence level of 95%b. the population mean with a confidence level of 98%
Statistics and Probability, Statistics
Returns on stocks X and Y are listed below: Period 1 2 3 4 5 6 7 Stock X 4%7%-2%40%0%10%-1% Stock Y 2%-5%7%4%6%11%-4% Consider a portfolio of 10% stock X and 90% stock Y. What is the (population) standard deviation of po ...
A company that sells annuities must base the annual payout on the probability distribution of the 2) length of life of the participants in the plan. Suppose the probability distribution of the lifetimes of the participan ...
Based on college data, scores on a certain test can be seen as normally distributed that can show the mean of 1524 and a standard deviation of 318. What percentage of scores are greater than 1842 and if needed round to t ...
Hayley Motorcycle Company just paid a dividend of $1.4 today, and is expected to pay a dividend in year 1 of $1.8, a dividend in year 2 of $2.3, a dividend in year 3 of $2.9, and a dividend in year 4 of $3.8. After year ...
A group of students made the following scores on a 10-item quiz in psychological statistics: {5, 6, 7, 7, 7, 8, 8, 9, 9, 10, 10} What is the variance, treating these scores as a sample?
A new computer system will require an initial outlay of $15,500, but it will increase the firm's cash flows by $3,100 a year for each of the next 7 years. How high can the discount rate be before you would reject the pro ...
Suppose you believe that Johnson Company's stock price is going to increase from its current level of $22.50 sometime during the next 6 months. For $250.30 you can buy a 6-month call option giving you the right to buy 10 ...
1) Is the magnitude of an earthquake related to the depth below the surface at which the quake occurs? Let x be the magnitude of an earthquake (on the Richter scale), and let y be the depth (in kilometers) of the qua ...
A representative from your company visited a prison and sampled 500 prisoners in Kailil, concluding that 90 of them are political prisoners. The Test hypothesis, at the 5% significance level, that one third of the prison ...
A. If n=7 (days campus is open) and p=0.22 (the probability that a student is on campus on any given day), determine the theoretical mean and standard deviation for the number of days on campus each week.
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