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1. A simple random sample of 40 adults Is obtained and each person's red blood cell count is measured (in microliters). The sample mean is 4.05. The population standard deviation for red blood cell counts is .40. Construct a 95% 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 -1.35 and 2.0 is
a. 0.3887
b. -.0658
c. 0.4332
d. .8887
4. A real estate agent records the ages of 50 randomly selected home buyers in her sales area. The mean age is 32 years, with a sample standard deviation of 7 years.
a. Find a 95% confidence interval for the population mean age.
5. A simple random sample of 125 SAT scores has a mean of 1500. Assume that SAT scores have a standard deviation of 250. Construct a 99% confidence interval estimate of the mean SAT score.
Find the probability that every tenant will pay the rent on time.- Find the probability that at least seven tenants will be late with their rent.
A student passes the test if his/her grade is larger than or equal the passing grade. What score should she set as the lowest passing grade?
there are two types of machines called type a and type b. both type a and type b can be used to produce a certain
Assume that male and female births are equally likely and that the birth of any child does not affect the probability of the gender of any other children.
the manager of a supermarket found that 72 of the shoppers who taste a free sample of a food item will buy the item.
Three research department have 7,6,9 members, respectively. Each department is to select a delegates and an alternate to represent the department at a conference. In how many ways can this be done?
a company is studying the feasibility of buying an elevator for a building under construction. one proposal is a
Neglect air resistance and the variation of its weight with altitude. The missile is launched vertically starting from rest.
1 a pump is designed to move and deliver to a vertical distance of 80 m what energy per kg of water must be supplied by
How do you find the intersection of the 2 events when calculating conditional probability?
calculate the expected to reach snake eyes, in equilibrium, and see if this resolves the apparent paradox. If you are still in doubt, simulate the experiment to decide which argument is correct. Can you give an intuitive argument which explains th..
They were based on the applicant's qualifications, interests, and other variables. Construct a 95% confidence interval for the proportion of all awards on this service made for reasons other than financial need.
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