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Find the necessary probability for normal distribution.
1. The scores on the verbal portion of the SAT have a normal distribution with a mean of 500 and standard deviation of 100.
-What is the proportion of people that score at least 700?
-If a student who took the SAT is randomly chosen what is the probability that the student scores at most 350 on the verbal portion?
-George scored higher than about 62 percent of the people on the verbal portion of the SAT. What is George score?
2. The average number of hours of sleep per night that a college freshman gets is 6.50 with a standard deviation of 1.80 hours. If 35 college freshmen are randomly chosen find the probability that they average at least seven hours of sleep per night.
If standard deviation is 50 hours and α is equal to 0.01, what values for mean x will result in rejection of null hypothesis.
A researcher measures a response variable Y and explanatory variable X on each of several objects. A scatterplot of the measurements is as follows.
The sample size n, the sample means, and the sample standard deviations for the two groups are given
Carry out F test for significance of straight line regression of Y on X and interpret your results.
Find the probability that in a given month:
Use this information to make a 95% confidence interval to evaluate true average number of copies made each day at this company.
The results of the simple linear regression are provided below.
Find out the expected shape of distribution of sample mean?
prevent coronary artery vasoconstriction and the attendant reduction in blood flow to the heart and mechanical function.
Sample data recently collected indicate that Dough Boy's crusts average 30 centimeter in diameter, with a standard deviation of 1.1 centimeters.
Assuming the nurses surveyed were a random sample from the population of all nurses in the United States, we can use these data to test the null hypothesis H0 that there is no association between the row and column variables in this two-way table...
Create a 95% confidence interval for true mean.
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