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1. A simple random sample of 50 adults Is obtained and each person's red blood cell count is measured (in microliters). The sample mean is 4.63. The population standard deviation for red blood cell counts is .54. Construct a 99% confidence interval estimate of the mean red blood cell count of adults. 2. What percentage of a normal distribution is within 2 standard deviations of the mean? (Select the closest answer.) a. 50%b. 95%c. 75%d. 100% 3. The area under the standard normal distribution between -2.5 and 1.5 isa. 0.1338b. 0.1668c. 0.4332d. None of the above 4. A real estate agent records the ages of 50 randomly selected home buyers in her sales area. The mean age is 38 years, with a sample standard deviation of 8 years.
a. Find a 99% confidence interval for the population mean age. 5. A simple random sample of 120 SAT scores has a mean of 1520. Assume that SAT scores have a standard deviation of 300. Construct a 95% confidence interval estimate of the mean SAT score.
What is given is the mean=27.2 kilograms and standard deviation=4.3 kilograms. I attempted to work out a which I know is wrong but this is what I did.
A machine cuts circular filters from large rolls of material. If 7.3% of the filters fail to meet specifications, use the normal approximation to the binomial to compute the probability that a sample of 100 of the filters will contain 5 or fewer that..
A researcher is comparing two antihypertensive drugs A and B with regards to reduction of patient's systolic blood pressure (SBP). Baseline SBP is measured for two groups of patients.
seventy percent of the bicycles sold by a certain store are mountain bikes. among 100 randomly selected bike purchases
given a normally distributed population with u 80 and 05. what is the probability of randomly drawing a score that
suppose you want to estimate the proportion of people in your community who would choose thin mints as their favorite
Using suitable probability model, calculate the probability of producing more than 3 faulty chips per hour.Explain the reasons for choosing your probability model.
From past experience, an automobile insurance company knows that a given automobile will suffer a total loss with probability .02, a 50% loss with probability .08, or a 25% loss with probability .15 during a year.
At the 0.05 significance level, can Ms. Bridgend conclude that she is earning an average of more than $20 in tips?
Find Karl Pearson's correlation coefficient between the sales and expenses from the data given below: Sales (Rs. Lakhs) 50 50 55 60 65 65 65 60 60 50 Expenses (Rs. Lakhs) 11 13 14 16 16 15 15 14 13 13?"
a table gives the number of medical doctors per 100000 people for each of the 50 states. it does not make sense to use
at a track and field tournament freds long jumps vary evenly from 6.5 to 7.2 meters. let x be the length of freds long
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