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A statistician needs to survey a sample of 50 people that is representative of voters in his community. He prepared a list of phone numbers of 50 randomly selected, expected voters
It is generally believed that electrical problems affect about 14% of new cars. What is the probablily that in this group over 18% of the new cars will be found to have electrical problems?
A certain town has 25,000 families. These families own 1.2 cars on the average; the SD is 0.90. And 10% of them have no cars at all. As part of an opinion survey, a simple random sample of 1600 fami
A construction company is planning to bid on a building contract. The bid costs the company $1600. The probability that the bid is accepted is 1/10. If the bid is accepted , the company will make $3
If you were to take a sample of companies with comparable size, market capitalization, and product category, and plot CEO salaries against the net profit of their respective companies, do you expect
The interval -0.5 cents to 0.5 cents. What is the probability that the round-off error exceeds 0.3 cents or is less than -0.3 cents?
Estimate a range of values centered about the mean in which about 95% of the state per captia income taxes will fall.
A driver hired at the beginning of a year can be used to meet the current year's requirements and is paid full salary for the current year. a. Determine how to minimize the bus company's salary, hir
Saturday night was taken and found that 95 of them were under the influence of alcohol. Test the law enforcement officer's claim at a 0.10 level of significance.
The sample mean is 2.59 and the sample standard deviation is .66. Conduct the following test using 95% level of confidence. Z-test for Unpaired dataCompute the statistical calculation
An airline estimates that 94% of people booked on their flights actually show up. If the airline books 63 people on a flight for which the maximum number is 61, what is the probability that the numb
The service found that only 45 bad checks appeard in a sample of 1124 cashed checks. Using Alpha = .01, test whether the new check verification system reduces the proportion of bad checks being cash
at a certain station customers arrive in poison process with an average time of 3 minutes between arrivals.The time interval between services at the station follow exponential distribution and as su
In excel and without using excel's regression feature construct a 99% confidence interval for the average monthly sales for all months with a 10% interest rate. report the upper bound of the CI.
What sample size is needed to estimate with 95% confidence the mean intake of calcium within 20 units of the true mean if the intake is from a normal distribution with a variance of 1900 units?
suppose that a small college claims that they graduate at leastb 500 students every semester.A random sample of 31 semesters yields a sample mean of 420, with standard deviation of s=65.Given that t
A company has random drug test employee numbers range from 1 to 6296. Find probability of selecting number less than 1000 and selecting a number divisible by 1000 ?
survey was mailed to a total of 400 students; 100 were randomly selected from each of the freshman, sophomore, junior and senior classes last semester. What sampling method was used?
If the level of confidence is reduced from 95% to 90%, but the allowable error and standard deviation remain the same, the sample size for the estimate of the mean should:
Assume the arrival follows a Poisson distribution, calculate the probability that Not a single customer arrived in a minute.
Test the hypothesis that = 800 hours against the alternative 800 hours if a random sample of 30 bulbs has an average life of 788 hours. Use a 0.04 level of significance.
The weights of items produced by a company are normally distributed with a mean of 4.5 ounces and a standard deviation of 0.3 ounces.
Which of the following statements is correct? A. An extremely small p-value indicates that the actual data differs markedly from that expected if the null hypothesis were true.
Production costs for a large number of previous orders of varying sizes for a product are in tha attached file. An analyst computes the production cost per unit in each order and averages these to g
what is the probability that the number of tails is between 87 and 100 inclusive. round the final answer to 4 decimal places.