Statistics

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 56% 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.

4.

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)

8

11

6

2

11

6

5

6

10

15

A) Calculate mean, and variance

B) Calculate 75th percentile

C) Determine the quartiles