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Exam 1: Introduction to Statistics

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Question 1

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Determine whether the numerical value is a parameter or a statistic. Explain your reasoning. -The average salary of all assembly-line employees at a certain car manufacturer is $42,000.

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It describes a param...

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Question 2

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Provide an appropriate response. -A college employs 85 faculty members. Without replacement, select the numbers of the five members who will serve on the tenure committee next year. $\begin{array} { l l l l l l l l } 16348 & 76938 & 90169 & 51392 & 55887 & 71015 & 09209 & 79157\end{array}$

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Question 3

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Determine whether the data are qualitative or quantitative. -the numbers on the shirts of a girlʹs soccer team

Identify the data setʹs level of measurement. -the final grades (A, B, C, D, andF) for students in a statistics class

Determine whether the study is an observational study or an experiment. -A pollster obtains a sample of students and asks them how they will vote on an upcoming referendum.

Provide an appropriate response. -After a hurricane, a disaster area is divided into 200 equal grids. Thirty of the grids are selected and every occupied household in the grid is interviewed to help focus relief efforts. Select the numbers of the first five grids that belong to the cluster sample. $\begin{array} { l l l l l l l l } 16348 & 76938 & 90169 & 51392 & 55887 & 71015 & 09209 & 79157\end{array}$

Identify the data setʹs level of measurement. -the annual salaries for all teachers in California

Identify the sampling technique used. -Based on 11,000 responses from 48,000 questionnaires sent to its alumni, a major university estimated that the annual salary of its alumni was $118,000 per year.

Determine whether the data are qualitative or quantitative. -the number of seats in a movie theater

Determine whether the study is an observational study or an experiment. -A medical researcher obtains a sample of adults suffering from diabetes. She randomly assigns 67 people to a treatment group and 67 to a placebo group. The treatment group receives a medication over a period of three Months and the placebo group receives a placebo over the same time frame. At the end of three months the Patientsʹ symptoms are evaluated.

Identify whether the statement describes inferential statistics or descriptive statistics. -Based on previous clients, a marriage counselor concludes that the majority of marriages that begin with cohabitation before marriage will result in divorce.

Identify the sampling technique used. -At a local community college, five statistics classes are randomly selected out of 20 and all of the students from each class are interviewed.

Determine whether the study is an observational study or an experiment. -A researcher obtained a random sample of 100 smokers and a random sample of 100 nonsmokers. After interviewing all 200 participants in the study, the researcher compared the rate of depression among the Smokers with the rate of depression among nonsmokers.

Provide an appropriate response. -Explain the differences between cluster sampling and stratified sampling.

Identify the population and the sample. -A survey of 1782 American households found that 80% of the households own a computer.

Identify the sampling technique used. -Every fifth person boarding a plane is searched thoroughly.

Identify the data setʹs level of measurement. -list of zip codes for Chicago

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

Use the Venn diagram to identify the population and the sample. -

Identify the data setʹs level of measurement. -the average daily temperatures (in degrees Fahrenheit) on five randomly selected days $\begin{array} { l l l l l } 34 & 22 & 31 & 21 & 38\end{array}$