The book we are suppossed to use is: Comprehensive School Health Education. I cant find any of the answers in it.

In a sixth-grade class, a social measure was administered to assess the degree of positive peer relationships for each of the students. The scores for the students were: 22, 3, 28, 2, 0, 1, 28, 5, 2, 33.

a) Find the median.


b) Find the mean.


c) Find the standard deviation.


d) Find the median if 4.2 is added to each data point.


e) Find the mean if 4.2 is added to each data point.


f) Find the standard deviation if 4.2 is added to each data point.


g) Find the median if each data point is multiplied by 7.4.


h) Find the mean if each data point is multiplied by 7.4.


i) Find standard deviation if each data point is multiplied by 7.4.

14 randomly chosen students have each won a free ticket to play a game of chance. In this game a wheel is spun that has been equally divided among 20 values, and when the wheel stops spinning a pointer will have selected one of the 20 values randomly (think Wheel-of-Fortune style). So therefore we will assume that each of the 20 outcomes is equally likely. Before spinning, the player chooses which value they think it will stop on. If it stops on the value chosen, they win $300. If it stops on the position to the left or right of the value chosen, they still win $100 for getting close. Otherwise, they win nothing. What is the probability that exactly 3 of the students will win some money? Leave your answer as a decimal.

Identify the dependent variable and the independent variable (or variables) and comment on the validity of the implied causal relationship:

1. A study that looks at students’ college GPAs and how they are affected by the students’ number of weekly study hours, high school GPA, and number of weekly hours of extra-curricular activities.

2. A young pitcher wants to understand how she can improve her pitches. She collects data on the number of strikes thrown in a pitched game, the average number of practice pitches per day in the week leading up to a game, the number of hours spent working with her coach the week before the game, and the time spent warming up right before the game.

3. A researcher proposes to study the effect of weight and height on a person’s body mass index (BMI).

A 2010 study asserts that the number of hours that the average college student studies each week has been steadily dropping (The Boston Globe, July 4, 2010). In fact, the researchers state that, in the U.S., today’s undergraduates study an average of 14 hours per week. Suppose an administrator at a local university wants to show that the average study time of students at his university differs from the national average. He takes a random sample of 35 students at is university and finds that the average number of hours spent studying per week is 16.3. Assume that the population standard deviation is 7.2 hours. At 0.05 level of significance, what is the test statistics for testing the hypotheses H0: µ = 14 versus H1: µ ≠ 14?

A high school psychologist was concerned about the equivalency of two types of standardized tests given to students as part of their college entrance exams. She set out to see if there was a positive correlation between the two exams. She sampled 5 students who took both exams. Use the data below to answer questions 10-14:

Subject                Test A                   Test B

1                          700                         35

2                          772                         38

3                          605                         36

4                          721                         39

5                          695                         34

10. What is the correlation coefficient?
11. How many tails does the test have?
12. What are the degrees of freedom?
13. What is the critical r value for a level of significance of 0.01?
14. What do you conclude about the data?

Question 5                                                                                                                       [12 marks]

Scientists have shown that getting a good night’s sleep is critical to your health. According to stats Canada, 40% of Canadians get enough sleep each night. A survey of 1,000 BCIT students found 355 of them got enough sleep each night.

At the 5% level of significance, is there evidence that the proportion of BCIT students who got enough sleep is different from the 40% overall in Canada? You must include the null and alternative hypotheses, a diagram, a decision with justification, and a conclusion. [9 marks]

H₀:                                                                                                                                                                                             

H_A:                                                                                                                                                                                            

Test Statistic:                                                            

Decision:                                                                                                                  

Conclusion: Circle the Correct One:

yes or no

2. Calculate the p-value AND confirm that it supports your conclusion in (a) above. [3 marks]

P-Value/Confirm:                                                                                                               

Eight students were given a quiz before & after they took review classes had the following ratings:

1. What is the critical value at the .05 level of significance?

2. What is the test statistic?

3. At an .05 level of significance, can we conclude that the review classes were helpful?

Using the data above, assume that these were scores of two groups of 8 students on the quiz either before or after the review class.

3. What is the critical value at the .05 level of significance?
4. What is the test statistic?
5. At an .05 level of significance, can we conclude that the review classes were helpful

At 10 p.m., the manager of Grassy's Pub at St. Agnes University realizes that he is in danger running out of beer before the end of the night. He has one keg containing 200 litres of beer with 5% alcohol, but the students are drinking at a rate of 50 litres per hour. To try and prolong his supply he turns on the water tap and leaves it running, adding water to the keg at a rate of 25 litres per hour. Leaving aside the moral and aesthetic issues involved in this scenario, find an equation for the percentage of alcohol as a function of time in the diluted beer he is serving. What will be the concentration when the bar closes at 3 a.m.? (Assume the students continue to drink at the same rate until the bar closes.)

In a sixth-grade class, a social measure was administered to assess the degree of positive peer relationships for each of the students. The scores for the students were: 22, 3, 12, 2, 0, 1, 28, 5, 25, 33.

a) Find the median.


b) Find the mean.


c) Find the standard deviation.


d) Find the median if 6.4 is added to each data point.


e) Find the mean if 6.4 is added to each data point.


f) Find the standard deviation if 6.4 is added to each data point.


g) Find the median if each data point is multiplied by 4.1.


h) Find the mean if each data point is multiplied by 4.1.


i) Find standard deviation if each data point is multiplied by 4.1.