stats homework problems

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Homework 1

1. A politician who is running for mayor of Riverside with 350,000 registered voters conducts a survey. In the survey, 76% of the 500 registered voters interviewed say they planned to vote for her.

A) What is the population of interest?

B) What is the sample?

C) Is the 76% a parameter or a statistic?

2. The grades on a statistics exam for a sample of 40 students are as follows:

63	74	42	65	51	54	36	56	68	57
62	64	76	67	79	61	81	77	59	38
84	68	71	94	71	86	69	75	91	55
48	82	83	54	79	62	68	58	41	47

3. Construct frequency and relative frequency distributions for the data using seven class intervals using Excel. Submit excel file separately.

3. The following table represents exam grades from 36 students in a statistics class. Construct a pie chart using classes with grades 51-60, 61-70, 71-80, 81-90, and 91-100, using Excel. Submit excel file separately.

60	79	75	84	85	74
81	95	89	58	66	98
99	99	62	86	85	99
79	82	98	72	72	72
75	88	86	81	96	86
78	91	83	85	92	68

4. The following data represents the years of service for 10 employees at a particular company.

(Show mathematical steps in detail to receive full credit)

A) Calculate mean, and variance

B) Calculate 75th percentile

C) Determine the quartiles

63	74	42	65	51	54	36	56	68	57
62	64	76	67	79	61	81	77	59	38
84	68	71	94	71	86	69	75	91	55
48	82	83	54	79	62	68	58	41	47

60	79	75	84	85	74
81	95	89	58	66	98
99	99	62	86	85	99
79	82	98	72	72	72
75	88	86	81	96	86
78	91	83	85	92	68

63	74	42	65	51	54	36	56	68	57
62	64	76	67	79	61	81	77	59	38
84	68	71	94	71	86	69	75	91	55
48	82	83	54	79	62	68	58	41	47

60	79	75	84	85	74
81	95	89	58	66	98
99	99	62	86	85	99
79	82	98	72	72	72
75	88	86	81	96	86
78	91	83	85	92	68

63	74	42	65	51	54	36	56	68	57
62	64	76	67	79	61	81	77	59	38
84	68	71	94	71	86	69	75	91	55
48	82	83	54	79	62	68	58	41	47

60	79	75	84	85	74
81	95	89	58	66	98
99	99	62	86	85	99
79	82	98	72	72	72
75	88	86	81	96	86
78	91	83	85	92	68