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Census data show that 14?% of students in a certain country went to college or a trade school within a year of graduating from high school. A random sample of 495 high school graduates is selected. Use the normal approximation to the binomial distribution to complete parts a through e below.
a. What are the mean and standard deviation of this? distribution?
b. What is the probability that 80 or fewer students will go to? college?
c. What is the probability that exactly 80 students will go to? college?
d. What is the probability that 80 or more students will go to? college?
e. What is the probability that between 80 and 84 ?students, inclusive, will go to? college?
Reconsider the corn yield and rainfall data (Display 9.18; data file ex0915). Fit the regression of yield on rainfall, rainfall-squared, and year. Use the approach of Section 10.4.5 to find the rainfall that maximizes mean yield.
Explain, how it will affect mean and median.
Michelle is a counselor at the local crises center. She wishes to determine if there is a relationship between the gender of an individual and the amount of alcohol consumed.
the following is a set of data from a sample of n 11 items x 7 5 8 3 6 10 12 4 9 15 18 y 21 15 24 9 18 30 36 12 27 45
Student record revealed that 16 out of a random sample of 64 of student with loans. It supposed that current rate is persisting across all students. Compute probability that number of students with loans will be less than 375.
Suppose that you are given a new sample statistic to serve as an estimator of some population parameter. You are unable to assume any theoretical results.
Length of pregnancies. The length of human pregnancies from conception to birth varies according to a distribution that is approximately Normal with mean.
the maker of a shampoo knows that customers like this product to have a lot of foam. ten sample bottles of the product
A better case can be made that observation 13 (Los Arboles) is an outlier. Describe what this means in plain terms.
examine the histogram of the standardized residuals for the regression of annual earning on annual hours worked among
What factors should the vice-president consider in determining the presence of employee burnout? Do employees take more than 1.4 weeks of vacation?
For a car travelling at 30 miles per hour, the mean stopping distance is 50 feet with a standard deviation is 8 feet, with the stopping distances
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