Exam 1: Introduction to Statistics

Determine which of the four levels of measurement is most appropriate. -A stock analyst selects a stock from a group of twenty for investment by choosing the stock with the greatest earnings per share reported for the last quarter.

which of these types of sampling is used -The name of each contestant is written on a separate card, the cards are placed in a bag, and three names are picked from the bag.

which of these types of sampling is used -To avoid working late, a quality control analyst simply inspects the first 100 items produced in a day.

Determine which of the four levels of measurement is most appropriate. -Amount of fat (in grams)in cookies.

Provide an appropriate response. -Distinguish between qualitative and quantitative data. Give an example for each.

Solve the problem. -A gardener has 56 clients, 50% of whom are businesses. Find the number of business clients.

Perform the requested conversions. Round decimals to the nearest thousandth and percents to the nearest tenth of a percent, if necessary. -Convert 1.1 to an equivalent fraction and percent.

Determine which of the four levels of measurement is most appropriate. -A T.V. show's executives raised the fee for commercials following a report that the show received a "No. 1" rating in a survey of viewers.

Determine which of the four levels of measurement is most appropriate. -The total number of phone calls a sales representative makes in a month is 425.

which of these types of sampling is used -A researcher interviews 19 work colleagues who work in his building.

Provide an appropriate response. -Explain what is meant by the term "confounding" and give an example of an experiment in which confounding is likely to be a problem.

Provide an appropriate response. -List five different abuses of statistics and give examples for each.

Provide an appropriate response. -Define and give examples for nominal, ordinal, interval, and ratio levels of measurement. Describe the type of statistics which might be reported for each.

which of these types of sampling is used -A pollster uses a computer to generate 500 random numbers, then interviews the voters corresponding to those numbers.

Determine which of the four levels of measurement is most appropriate. -Ages of survey respondents.

Use critical thinking to address the key issue. -100,000 randomly selected adults were asked whether they drink at least 48 oz of water each day and only 45% said yes.

Identify the number -The height of 2-year-old maple tree is 28.3 ft.

which of these types of sampling is used -An education researcher randomly selects 48 middle schools and interviews all the teachers at each school.

Provide an appropriate response. -Define random sample. Explain why this is important in design of experiments.

Determine which of the four levels of measurement is most appropriate. -On a test, Shoshana got 65% or 39 of the items correct. How many items were on the test?