easy Business stats HW

Turn-in Assignment for Unit #1

1. For each of the scenarios below, specify the branch of statistics (D for descriptive or I for inferential) being illustrated:

(a) a college employee prepared a frequency distribution of the ages of the college's 11,000 students _____

(b) based on a survey of 1000 consumers, it was determined with 99% confidence that between 80 and 85 per cent of all U.S. consumers reduced their beef consumption last quarter _____

(c) in a particular county, the median household income of those households surveyed by the Census Bureau in 2007 was $34,000 _____

(d) an analysis of the weights of a sample of 10 crates of oranges in a large shipment received from a supplier caused a grocery store manager to conclude the mean weight of all the crates in the shipment was below the required minimum _____

2. Identify each of the following with the appropriate symbol:

a) size of sample; ______

b) mean of sample; ______

c) standard deviation of sample; ______

d) mean of population; ______

e) standard deviation of population ______

3. Below are the fiber contents (in grams) of eightounce servings for a sample of cereals sold in a grocery store:

0, 1, 4, 2, 0, 1, 0, 0, 1

Determine for this sample:

(a) the mean fiber content _____

(b) the median fiber content _____

(c) the mode fiber content _____

(d) the variance in the fiber content _____

(e) the third quartile _____

7. For each of the following variables, identify whether it is qualitative – “L” or quantitative – “N” and indicate its scale of measurement (Nominal –“N”, Ordinal – “O”, Ratio – “R”, Interval – “I”, :

(a) weight of a truck weighed in at a particular weighing station yesterday _____ _____

(b) number of employees in a small business _____ _____

(c) favorite TV program of a senior citizen in the U.S. _____ _____

(d) completed level of education (less than high school, high school, bachelor’s degree, advanced degree) of an adult in Georgia _____ _____

(e) noonday temperature (in degrees Celsius) in Kennesaw _____ _____

9. At the right is the (hypothetical) x f(x)

probability distribution of 0 .20

X = "the number of PCs (personal 1 .58

computers) in a randomly selected 2 .18

residence in Mississippi" 3 .04

(a) What is the probability that a randomly selected residence in Mississippi contains at least two PCs? _____

(b) What is the mean number of PCs in the residences in Mississippi? _____

(c) What is the standard deviation in the number of PCs in the residences? _____