Suppose that a firm is investigating attitudes toward a soci…

Suppose that a firm is investigating attitudes toward a social/political topic within a specific city.  They plan to do this with a survey, but the issue is controversial.  The lead researcher is concerned that only the people with strong opinions will return a mail survey, therefore creating bias results.  The researchers concern could be characterized as a concern about

In a survey among college students a researcher asks the fol…

In a survey among college students a researcher asks the following question: “Approximately how many cans of soft drink do you consume a week?     ________  number of cans”. The researcher finds for this question that the mean of weekly amount of soft drink consumption by males and females is about the same, but that the standard deviation among males is greater than that for females. Which of the following statements is true?

Suppose you are trying to measure the annual sales of cans o…

Suppose you are trying to measure the annual sales of cans of soft drink brand X.  To measure this you ask the following question:         “Roughly how many cans of soft drink X do you purchase in a given year?    _______cans   Which of the following is true?