Exam 1: Introduction to Statistics

Determine whether the study is an observational study or an experiment. -The personnel director at a large company would like to determine whether the company cafeteria is widely used by employees. She calls each employee and asks them whether they usually bring their own lunch, eat at The company cafeteria, or go out for lunch.

Provide an appropriate response. -A report sponsored by the California Citrus Commission stated that cholesterol levels can be lowered by drinking at least one glass of a citrus product each day. Determine if the report is biased.

Identify the data setʹs level of measurement. -the data listed on the horizontal axis in the graph

Identify the data setʹs level of measurement. -hair color of women on a high school tennis team

Identify the data setʹs level of measurement. -temperatures of 73 selected refrigerators

Identify whether the statement describes inferential statistics or descriptive statistics. -The chances of winning the California Lottery are one chance in twenty-two million.

Provide an appropriate response. -There are 750 incoming freshmen attending a university this fall. A researcher wishes to send questionnaires to a sample of 30 of them to complete regarding their drinking habits. Select the numbers of the first five freshmen who belong to the simple random sample. 16348 76938 90169 51392 55887 71015 09209 79157

Identify the data setʹs level of measurement. -the lengths (in minutes)of the top ten movies with respect to ticket sales in 2007

Identify the sampling technique used. -A researcher for an airline interviews all of the passengers on five randomly selected flights.

Identify the sampling technique used. -A researcher randomly selected 50 of the nationʹs middle schools and interviewed all of the teachers at each school.

Identify whether the statement describes inferential statistics or descriptive statistics. -There is a relationship between smoking cigarettes and getting emphysema.

Identify the sampling technique used. -To ensure customer satisfaction, every 5th phone call received by customer service will be monitored.

Determine whether the numerical value is a parameter or a statistic. Explain your reasoning. -A survey of 1208 students was taken from a university with 20,000 students.

Identify the data setʹs level of measurement. -number of milligrams of tar in 85 cigarettes