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3% of Americans surveyed lie frequently. Suppose you conduct a survey of 500 college students and find that 20 of them lie frequently. Compute the probability that, in a random sample of 500 student
In 2000, as reported by ACT Research Service, the mean ACT Math score was μ=20.7. If ACT Math scores are normally distributed with σ = 5, answer the following questions.
Suppose a simple random sample of size n = 34 is obtained from a population with μ = 30 and σ = 4.
Children toilet train (training age normally distributed) at an average of 26 months with a standard deviation of 2 months. What ages define the middle 80% of kids toilet training?
Levels above 200 warrant attention. If 95 teenage boys are examined. How many would you expect to have cholesterol levels greater than 225.
Before 1918, in a random sample of 13 wolves spotted in the region, what is the probability that 10 or more were male?
About 14% of all adults deliberately do a one-time fling and feel no guilt about it! In a group of seven adult friends, what is the probability that no one has done a one-time fling?
The average gasoline price of one of the major oil companies has been $1.25 per gallon. Recently, the company has undertaken several efficiency measures in order to reduce prices. Management is in
No children that is equal to the value obtained by the census. Give the z statistic (rounded to two decimal places) and the P-value. What do you conclude?
In a large section of statistics class, the points for the final exams are normally distributed with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following
Fifteen microprocessors are randomly selected from a lot of 750 microprocessors among which 30 are defective.
If a random sample of 40 customers is taken, what is the probability that the sample average expenditure per customer for this sample will be 87.00 or more?
The annual Salary of an electrical engineer is given in terms of the years of experience by the table below. Find the equation of linear regression for the above data and obtain the expected salary
What would happen to the confidence interval if you increased the sample size to 200? Why? What are the new margin of error and confidence interval?
Construct the indicated confidence interval for the difference between the two population means. Assume that the two samples are independent and that they have been randomly selected.
What is the probability that the sample mean price falls within a nickel of the State's overall mean price? i.e between 3.09 and 3.19
Can we conclude that if she repeats the same investment twice, the mean value of her net gain/loss will again be $2000? What if she repeats the experiment 10 times? Respond to at least two of your c
If the airline industry proudly announces that it has set a new record for the longest period of safe flights, would you be reluctant to fly? Are the airlines due to have a crash? Explain your answe
25% of their customer purchase package 2, 20% of their customers purchase package 3 and 25% of their customers purchase package 4. Find the expected value or average profit per customer.
If five flights are selected at random, find the probability of each of the following. Round your answers to 4 decimal places. Do you think the properties of the binomial distribution hold in this sit
A sample of 16 individuals from the Midwestern town of Webster City showed a sample mean annual consumption of 24.1 gallons with a sample standard deviation s=4.8. what is a point estimate off the d
what are our h0 and ha ? (c) compute zobt.(d) with a= .05, what is zcrit? (E) do we have evidence of a relationship in the population? if so describe the relationship.
Using the data from part a, what is the expected value of the flight times during this period. Round your answer to three decimal places.
The paint department has been given thear assignment of designing color codes for 42 different parts. There are a total of seven colors available. Three colors are to be used on each part. A combina
What is the probability that a random sample of n=242 people from the general population will have a mean IQ score that is less than or equal to 87?