quiz2 734

Quiz 2 – DSRT 734

1. A researcher wanted to know if a particular brand was preferred by different age groups. The researcher observed the data below. Is there a relationship between age and brand?

	Brand A	Brand B	Brand C
Under 30	120	130	110
30 – 50	77	127	140
50 and older	84	100	98

a. Which test are you using?

b. What are your H0 (null hypothesis) and Ha (alternative hypothesis)?

c. Calculate your statistic.

d. What decision does this inform you to make and why? (You may use the critical value in the chart or the calculated p-value, but you must indicate what you are doing.)

e. Write a one to two sentence conclusion that correctly responds to the question. REPORT YOUR STATISTICS IN APA FORMAT

2. Ms. Smith teaches three Algebra I classes that cover exactly the same content. She is wondering if changing the order of some of the lessons would be beneficial to students. In class A, she teaches everything in the traditional order. In class B, she decides to skip Chapter 1 as it is preliminary information that students may already know. In class C, she decides to do Chapter 5 prior to doing Chapter 3. She would like to know if there are any significant differences in the average scores of the three classes.

Class A	Class B	Class C
50.90	91.04	58.93
28.55	81.51	40.52
46.33	76.55	43.89
28.42	85.56	47.99
36.19	36.49	22.14
93.61	70.91	40.42
23.73	92.23	33.73
77.83	50.48	60.29
54.34	40.52	75.05
43.32	38.47	37.40
63.96	45.63	70.01
56.19	89.13	31.17
17.70	65.04	13.41
81.86	83.31	10.12
86.10	74.89	62.96
25.61	91.79	89.27
52.89	42.04	44.58
21.31	98.38	4.75
41.44	76.79	34.15
99.71	60.85	5.06
74.50	18.66	85.20
92.45	82.75	20.23
98.38	55.04	56.49
4.10	13.89	31.12
34.47	49.37	17.87

2. Which test are you using?

2. What are your H0 (null hypothesis) and Ha (alternative hypothesis)?

2. Calculate your statistic.

2. What decision does this inform you to make and why? (You may use the critical value in the chart or the calculated p-value, but you must indicate what you are doing.)

2. Write a one to two sentence conclusion that correctly responds to the question. Use APA format to report your statistic ex. [χ^2(df)=1.1, p<.05]