This is my statistics exam I need help I have been lost this whole semester Identify each of the following as...

1.Identify each of the following as examples of nominal, ordinal, interval, or ratio scales of measurement. 

1. A poll of registered voters in Florida asking which candidate they support 

2. The length of time required for a wound to heal when using a new medicine 

3. The number of telephone calls arriving at a switchboard per five-minute period 

4. The distance first-year college football players can kick a ball 

5. Mental health diagnoses present in an elderly population 

6. The rankings of employees on their job performance 

2) Two hundred raffle tickets are sold. Your friend has five people in her family who each bought two raffle tickets. What is the probability that someone from her family will win the raffle?



3) Jolie has 45 minutes to do her statistics homework. If the mean is 38 minutes and the standard deviation is 3, calculate Jolie's z score. Once calculated, interpret your findings in terms of Jolie's performance.



4) . A psychologist measures units of change for a memory test after students are given an opportunity to sleep only four hours. The following change units were obtained: 7, -12, 4, -7, 3, -10. Find the a) mean, b) median, c) mode, d) standard deviation, e) range, and f) variance. 

5) A student scored 81 on a chemistry test and 75 on a history test. For the chemistry test, the mean was 70 and the standard deviation was 20. For the history test, the mean was 65 and the standard deviation was 8. Did the student do better on the chemistry test or the history test? Explain your answer

6. Suppose you want to figure out what to do with your degree in psychology. You ask some fellow students from your psychology program who recently graduated to find out what they are doing with their degree and how much it pays. What type of sampling is this? What are the limitations of this sampling approach?

7. Variables in which the values are categories are known as) 

Interval variables

Nominal variables

Ordinal variables

Ratio variables

8. Before the researcher can conduct a statistical test, the research question must be translated into 

A testable hypothesis

Additional observations



Mathematical symbols



Numbers



9. The hypothesis stating that there are no differences, effects, or relationships is) 

The alternative hypothesis



The baseline hypothesis



The null hypothesis



The reasonable hypothesis



10. A group of students made the following scores on a 10-item quiz in psychological statistics: {5, 6, 7, 7, 7, 8, 8, 9, 9, 10, 10} What is the mean score? 

6.6



7.2



7.8



8.7

11. A group of students made the following scores on a 10-item quiz in psychological statistics: {5, 6, 7, 7, 7, 8, 8, 9, 9, 10, 10} What is the median score? 

6

7

8

9

12. A group of students made the following scores on a 10-item quiz in psychological statistics: {5, 6, 7, 7, 7, 8, 8, 9, 9, 10, 10} What is the mode? 

5

7

8

9



13. A group of students made the following scores on a 10-item quiz in psychological statistics: {5, 6, 7, 7, 7, 8, 8, 9, 9, 10, 10} What is the range of scores? 

5

6

7

11

14. A group of students made the following scores on a 10-item quiz in psychological statistics: {5, 6, 7, 7, 7, 8, 8, 9, 9, 10, 10} What is the variance, treating these scores as a sample? 

1.53

1.60



2.33



2.56

15. The standard normal distribution has all the following properties EXCEPT:) 

The mean, mode, and median are all equal



The total area under the curve equals 1



The curve is specified by two parameters, the mean and the standard deviation



The curve extends to + and – 3 standard deviations from the mean

16. According to the Empirical Rule, approximately _______% of the data in a normal distribution will fall within ±1 standard deviation of the mean. (Points : 4) 

34

68



95



99.7

17. In statistical computations, the number of values that are free to vary is known as (Points : 4) 

Degrees of freedom



Freedom factor



Variability index



Variation quotient

18. Which of the following reflects a Type I error? 

Rejecting the null hypothesis when in reality the null hypothesis is true



Rejecting the null hypothesis when in reality the null hypothesis is false



Accepting the null hypothesis when in reality the null hypothesis is true



Accepting the null hypothesis when in reality the null hypothesis is false





18. Which of the following reflects a Type I error? 

Rejecting the null hypothesis when in reality the null hypothesis is true



Rejecting the null hypothesis when in reality the null hypothesis is false



Accepting the null hypothesis when in reality the null hypothesis is true



Accepting the null hypothesis when in reality the null hypothesis is false





19. Which type of sampling is used when the experimenter asks 5 area doctors to refer pregnant women to his study and accepts all women who offer to be in his study? (Points : 4) 

purposive sampling



convenience sampling



cluster sampling



stratified sampling





20. In our statistics equations, n refers to: (Points : 4) 

mean



standard deviation



normal distribution



number of subjects