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The National Center for Education Statistics reported that mean number of instructional computers per public School nationwide was 124. Assume that the standard deviation is 49 computers and that there is no information about the shape of the distribution. Suppose we take a sample of size 75 public schools, and suppose we are interested in the probability that the sample mean number of instructional computers less than 100.a. If possible. Find P( ) < 100). If not possible explain why not.b. What is the probability that a sample of size 75 public schools will have more than a 100 instructional computers?
A laboratory tested 70 chicken eggs and found that the mean amount of cholesterol was 229 milligrams with s = 19.9 milligrams. Construct a 95% confidence interval for the true mean cholesterol content of all such eggs.
The following show the hours of sleep on weeknights for a sample of individuals age 49 and younger and for a sample of individuals age 50 and older.
Obtain the simple linear regression equation, then analyze the residuals by (a) constructing a histogram
Find out sample correlation coefficients of (I) age with dry weight, and (2) age with log 10 dry weight. Interpret your results.
Obtain a 95% confidence interval for the mean monthly rent for two-bedroom apartments. Assume that measurements are normally distributed. Round to two decimal places.
Probability using Z-score.Find the probabilities that a random variable Z having a standard normal distribution will take on a value.
What do the coefficients of the regression line tell you about the relationship between mortgage rates and housing starts?
30% student take only Chinese, 30 % student take only Maths. It is found that both male n female has the equal chance to wear spectacles. Draw a tree diagram.
Sample is found to have a mean of 80.6,a standard deviation of 1.4 test the claim that the true mean of this process is different than 80. use 10% level of significance.
What is the Bonferroni adjustment? What would the Bonferroni adjustment be for a study with four groups for which a researcher decided to use t-tests?
According to the historical data, the life expectancy in the United States is equal to the life expectancy in Japan. A new study has been made to see whether this has changed.
If it takes a colony of termites one day to devour a block of wood that is 2 inches wide, 2 inches long, and 2 inches high, then how long will it take them to devour a block of wood that is 4 inches wide,
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