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A professor at a local university noted that the grades of her students were normally distributed with a mean of 73 and a standard deviation of 11.
1. The professor has informed us that 7.93 percent of her students received grades of A What is the minimum score needed to receive a grade of A?
2. Students who made 57.93 or lower on the exam failed the course. What percent of students failed the course?
3. If 69.5 percent of the students received grades of C or better, what is the minimum score of those who received C's?
We would like to test if the proportion of respondents that support the health care bill is less than 50% (a) what kind of hypothesis test is appropriate?
If you wish to estimate a population mean with a sampling distribution error SE = 0.28 using a 95% confidence interval and you know from prior sampling that sigma^2 is approximately equal to 5.4, how many observations would have to be included in ..
If we repeated this procedure many, many times, only 5 percent of the 95 percent confidence intervals would fail to include the mean Math SAT score of the population of all students at this college.
Find the critical value(s). (e) Based on your answers for parts (a) to (d), will you reject or fail to reject the null hypothesis? State your conclusion in the context of the application.
Explain the value of test statistic using t distribution for the given value. Illustrate value of the t test statistic if you are testing a hypothesis.
What is the probabillity that in a random sample of 1,200 undergraduate business students, 336 or more will major in accounting?
The booked passengers actually arrive for the flight. Estimate the probability that if the company books 170 persons, not enough seats will be available.
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
They then call these 100 people. Does this sampling plan result in a random sample? Simple random sample? Explain.
Consumers reported on average 1.7 problems per vehicle with a popular make and model of a 2006 car. We randomly select a vehicle of the same make, model, and year.
At a national seashore, the number of swimmers per day who require lifeguard assistance averages 4.1, on any day when 7 or more swimmers are assisted, the lifeguards receive a $20 bonus for extra effort.
What linear transformation will change sixth grade scores x into new scores xnew= a+bx that have the desired mean and standard deviation?
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