Statistics and Probability Answers

5. If exactly one number in a set of data is changed, will this necessarily change the 

median of the set? Explain.

6. If a set of data has a mode, then must the mode be one of the numbers in the set? 

Explain.

your younger brother is getting stickers from a vending machine at the local supermarket. a proportion of stickers have the phrase "girls rule." if there are 8 stickers with this message in a sample of 36 stickers, what is the 95% confidence interval for this proportion

Audience profile data colected at kaap agri web site showed that 70 percent of th users were men . Assume that this percentage was based on sample 1300 users. wh is the margin of error asociated with the estimated proportion of users who are men at 95 percent confidence level

Assume that when adults with smartphones are randomly​ selected, 47​% use them in meetings or classes. If 9 adult smartphone users are randomly​ selected, find the probability that exactly 7 of them use their smartphones in meetings or classes.

34​% of U.S. adults say they are more likely to make purchases during a sales tax holiday. You randomly select 10 adults. Find the probability that the number of adults who say they are more likely to make purchases during a sales tax holiday is​ (a) exactly​ two, (b) more than​ two, and​ (c) between two and​ five, inclusive.

There are 23 learners in a grade 6 classroom, of which 13 are boys And 10 are girls. The teacher chooses two different learners at a random to answer questions draw a tree diagram to respresent the situation

The probability that machine P will breakdown is 2/7 and the probability that machine Q will breakdown is 3/11.Find the probability that at least on machine will be working

The time taken X by a garage to repair a car is a continuous rv with pdf f(x) = { 3x/4 (2 − x); 0 ≤ x ≤ 2 0; elsewhere If, on leaving his car, a motorist goes to keep on an engagement lasting for a time Y, where Y is a continuous rv independent of X, with pdf f(y) = { 1/2 y; 0 ≤ y ≤ 2 0; elsewhere . Determine the probability that the car will not be ready on his return.

A poll of 400 Califorinans found that 83% were in favor of a mandatory 14-day quarantine for anyone who has come into contact with a person who tested positive for COVID-19. Use the z-test with a level of significance =.025 to test the claim that more than 80% of Califorinans are in favor of the mandatory 14-day quarantine period. >Z-table

Blood glucose levels for obese patients have a mean of 100 with a standard deviation of 15. A researcher thinks that a diet high in protein will have a positive or negative effect on blood glucose levels. A sample of 30 obese patients who have tried a high in protein diet have a mean glucose level of 94. Test the hypothesis that a diet high in protein has an effect on blood glucose using a z-test with a level of significance =.04. Z-table