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The probability that someone in the human population has blood type AB is about p = .08; the probability that someone has blood type O is about p = .25. Knowing that each individual can have one and
The probability that a parent rewards a child with a dessert for eating a healthy meal is .07. Assuming independent outcomes, the probability that two parents reward their child's healthy eating equ
Using 10 pairs of sample data, if you compute the value of the linear correlation coefficient r and obtain a result of 0.989, then you can conclude that a strong correlation exists.
What is the final conclusion obtained when testing the claim that p > 0.25, given that the P-value is 0.5555?
For a normal distribution, which distribution is used to test the claim that a population has a standard deviation equal to 0.75, given a sample of 25 values with a sample mean of 98.2 and a sample
For a normal distribution with ? < 98.6, given a sample of 25 values with a sample mean of 98.2 and a sample standard deviation of 0.62. Which distribution is used to test this claim.
Find the P-value obtained when testing the claim that p = 0.75 when given sample data resulting in a test statistic of z = 1.20.
A researcher selects a sample of 6 professors, 6 students, and 6 administrators at a local school and has them rate the effectiveness of an innovative new teaching style. In this example, is it poss
When calculating a sample size for a hypothesis test with the altenative hypothesis being: Ha: µ1?µ2
The annual income of residents in a county is $42,000 with a standard deviation of $10,000. Assuming that the distribution of incomes is normal, between what two values do approximately 95% of the i
State the appropriate null and alternative hypotheses. Based on the sample data, test the null hypothesis using an ? = .05. Discuss the results of the test.
Assume that price of the Microsoft Windows Upgrade that year were normally distributed, with a standard deviation of $8.53. If 36 retailers of computer software are selected that year, what is the
In the past, patrons of a cinema complex have spent an average of $5.00 for popcorn and other snacks, with a standard deviation of $1.80. If a random sample of of 32 patrons is taken, what is the pr
Assuming the distribution of study times is normal, what percent of students spend more than 25 hours per week on homework?
The shelf life of a battery produced by one major company is known to be normally distributed, with a mean life of 3.5 years and a standard deviation of 0.75 years. What is the upper quartile of bat
Auto glass companies now have a machine that can repair broken windshields with a success rate of 85%. If a random sample of six cars is taken from the customer Records, determine the probability th
The average family income in the town of Seneville is $45 000, with a standard deviation of $9000. Assuming that family income is normally distributed, determine the income level below which 80% of
In a simple linear regression based on 30 observations, the following information is provided: y=-6.92+1.35x and se=2.78. Also, se(y0) evaluated at x=30 is 1.02. Construct a 95% prediction interval
A professor has found that the grades on the statistics final are normally distributed with a mean of 68 and a standard deviation of 15. If only the best 14% of the grade will receive an A, what gra
The following estimated regression equation relates sales to inventory investment and advertising expenditure. y=25+10x1+8x2 The data used to develop the model came from a survey of 10 stores;
A cracker bakery wants to test microwaving crackers after breaking to reduce the risk of broken crackers at the time the package is opened.
Two random samples are taken, with each group asked if they support a particular candidate. A summary of the sample sizes and proportions of each group answering yes'' are given below:
A major chain of food stores wants to determine the proportion of customers who buy on impulse. The company decided to use a sample large enough to estimate the proportion of impulse buyers within 2
A bank's loan officer rates applicants for credit. The ratings are normally distributed with a mean of 200 and a standard deviation of 50. If 49 different applicants are randomly selected find the
When n =20 and p= 0.1, I can approximate the distribution of the sample proportion with a normal distribution with mean 2 and standard deviation 1.34. True or False?