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Q1) Determine probability, P(Z < 0.17), using standard normal distribution.
a) .8300
b) .4325
c) .5675
d) .0675
Q2) Average height of flowering cherry trees in nursery is 11 feet. If heights are normally distributed with standard deviation of 1.6, determine probability that randomly selected cherry tree in this nursery is less than 13 feet tall.
a) 0.67
b) 0.89
c) 0.95
d) 0.11
Q3) Mrs. Smith's reading class can read mean of 175 words per minute with standard deviation of 20 words per minute. Top 3% of class is to get a special award. Determine the minimum number of words per minute student would have to read to get award?
Create a 90% confidence interval for mean score on this placement exam for all students.
You have been given a report that presents two regression models with different numbers of independent variables. You do not have the data so you cannot re computed regression models. Nevertheless, you have been asked to find out which model is b..
Provide a brief description of the main features of these data from the scatter plot and Describe why you would use performance as the predictor variable and performane related pay as the dependent variable in such a model.
Assume 1.5% of antennas on new Nokia cell phones are imperfect. For random sample of 200 antennas, determine the probability that: None of the antennas is defective.
Test hypothesis that mean weight of 2 sheets are equal against alternative that they are not(suppose equal variances). Use α=0.05 and suppose equal variances. Determine the P value.
What can we conclude from these figures at a level of significance of .01?
Public transportation and the automobile are two methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
The data in the scatterplot below are an individual's weight and the time it takes (in seconds) on a treadmill to raise his or her pulse rate to 140 beats per minute. The o's correspond to females and the +'s to males.
What is the expected number of Republicans who will win office in the coming election?
Determine x-bar and s for this data set. You may suppose the values for bulb life are normally distributed. Use traditional method to make your decision.
The world record time (in minutes) in the marathon is plotted versus the year in which the record was set for men and women separately. The plotting symbol o is used for men and x for women. The data include only records set between 1908 and 1988.
Evaluate the difference in the mean ratings and find the standard deviation of the difference in the ratings, what is the chance both children are boys?
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