Exam 1: Introduction to Statistics

Perform the requested conversions. Round decimals to the nearest thousandth and percents to the nearest tenth of a percent, if necessary. -Convert the fraction $\frac { 3 } { 4 }$ to an equivalent decimal and percentage.

Provide an appropriate response. -Define the terms "stratified sampling", "systematic sampling", "cluster sampling", and "convenience sampling". Give examples for each.

which of these types of sampling is used -A market researcher selects 500 drivers under 30 years of age and 500 drivers over 30 years of age.

Use critical thinking to address the key issue. -A researcher wished to gauge public opinion on gun control. He randomly selected 1000 people from among registered voters and asked them the following question: "Do you believe that gun control laws which restrict the ability of Americans to protect their families should be eliminated?". Identify the abuse of statistics and suggest a way the researcher's methods could be improved.

Determine which of the four levels of measurement is most appropriate. -Student's grades, A, B, or C, on a test.

Use critical thinking to address the key issue. -In a poll of 50,000 randomly selected college students, 74% answered "yes" when asked "Do you have a television in your dorm room?".

Use critical thinking to address the key issue. -"38% of adults in the United States regularly visit a doctor". This conclusion was reached by a college student after she had questioned 520 randomly selected members of her college. What is wrong with her survey?

Perform the requested conversions. Round decimals to the nearest thousandth and percents to the nearest tenth of a percent, if necessary. -Convert $\frac { 9 } { 125 }$ to an equivalent decimal and percent.

which of these types of sampling is used -A market researcher selects 500 people from each of 10 cities.

Determine which of the four levels of measurement is most appropriate. -A T.V. show's executives commissioned a study to gauge the impact of the show's ratings on the sales of its advertisers.

which of these types of sampling is used -49, 34, and 48 students are selected from the Sophomore, Junior, and Senior classes with 496, 348, and 481 students respectively.

Determine which of the four levels of measurement is most appropriate. -A marketing firm does a survey to find out how many people use a product. Of the one hundred people contacted, fifteen said they use the product.

Determine which of the four levels of measurement is most appropriate. -Temperatures of the ocean at various depths.

Determine which of the four levels of measurement is most appropriate. -The sample of spheres categorized from softest to hardest.

Provide an appropriate response. -Define the terms population, sample, parameter and statistic. How does a census compare to a sample?

Use critical thinking to address the key issue. -In a study of headache patients, every one of the study subjects with a headache was found to be improved after taking a week off of work. Conclusion: Taking time off work cures headaches.

Perform the requested conversions. Round decimals to the nearest thousandth and percents to the nearest tenth of a percent, if necessary. -Convert 0.13 to an equivalent fraction and percent.

Perform the requested conversions. Round decimals to the nearest thousandth and percents to the nearest tenth of a percent, if necessary. -Convert $87.5 \%$ to an equivalent fraction and decimal.

Provide an appropriate response. -Define sampling error and nonsampling error. Give examples of nonsampling error.

Use critical thinking to address the key issue. -A study shows that adults who work at their desk all day weigh more than those who do not. Conclusion: Desk jobs cause people to gain weight.