Exam 1: Introduction to Statistics

Identify the data setʹs level of measurement. -the amounts of fat (in grams)in 29 cookies

Provide an appropriate response. -Explain the difference between a census and a sampling and describe the advantages and disadvantages of each.

Provide an appropriate response. -Of the 5000 outpatients released from a local hospital in the past year, one hundred were contacted and asked their opinion on the care they received. Select the first five patients who belong to the simple random sample. 16348 76938 90169 51392 55887 71015 09209 79157

Identify the data setʹs level of measurement. -list of 1239 social security numbers

Provide an appropriate response. -Explain why data expressed with the Celsius temperature scale is at the interval level of measurement rather than the ratio level.

Identify the experimental units and treatments used in the experiment. -A medical researcher center wants to test the effectiveness of a new diabetes medication. The company identifies 82 adults suffering from a similar form of diabetes. The subjects are randomly assigned to two groups. One group is given a medication and the other is given a placebo that looks exactly like the medication. After three months, the subjectsʹ symptoms are studied and compared.

Identify the sampling technique used. -A community college student interviews everyone in a statistics class to determine the percentage of students that own a car.

Identify the data setʹs level of measurement. -numbers on the shirts of a girlʹs soccer team

Provide an appropriate response. -Explain the differences between the interval and ratio levels of measurement.

Determine whether the data are qualitative or quantitative. -the number of complaint letters received by the United States Postal Service in a given day

Determine whether the data are qualitative or quantitative. -the colors of automobiles on a used car lot

Provide an appropriate response. -If you had to do a statistical study, would you use a sample or a population? Why?

Identify the population and the sample. -When 1886 American households were surveyed, it was found that 85% of them owned two cars.

Identify the data setʹs level of measurement. -the years the summer Olympics were held in the United States

Identify the data setʹs level of measurement. -manuscripts rated ʺacceptableʺ or ʺunacceptableʺ

Identify the sampling technique used. -A market researcher randomly selects 100 drivers under 45 years of age and 200 drivers over 45 years of age.

Determine whether the data set is a population or a sample. -The age of every fourth person entering a department store

Determine whether the study is an observational study or an experiment. -A poll is conducted in which professional musicians are asked their ages.

Identify the population and the sample. -A survey of 2625 elementary school children found that 28% of the children could be classified as obese.

Identify whether the statement describes inferential statistics or descriptive statistics. -From past figures, it is predicted that 41% of the registered voters in California will vote in the June primary.