Question

3.) create a qualitative frequency - distribution of the following: a class of 30 students took a statistics exam and the following letter grades were assigned. 9 students received a c; 8 students received an a; 5 students received a b; 4 students received a b; 1 student received a c; 6 students received an a; 3 students received a b; 2 students received a d; 6 students received an f. (a) is this data nominal or ordinal? (2 points) (b) letter grade frequency (6 points) 6.) for each statement, decide whether it is descriptive or inferential. (6 points) (a) the average life in new york is 78 years old. (b) a diet consisting of fruits and vegetables may lower high blood pressure. (c) the total estimated losses from hurricane katrina is $125 billion.

Explanation:

Step1: Define descriptive and inferential statistics

Descriptive statistics summarize data, while inferential statistics make predictions or generalizations.

Step2: Analyze statement (a)

The average life - span in New York is a summary statistic, so it is descriptive.

Step3: Analyze statement (b)

Saying a diet may lower blood pressure is making a prediction, so it is inferential.

Step4: Analyze statement (c)

The total estimated losses from Hurricane Katrina is a summary value, so it is descriptive.

Answer:

(a) Descriptive
(b) Inferential
(c) Descriptive