LT 13e

The 90% interval for a statistics test was given by 72 +- 7. What is the lower value for the interval?

• 7
• 72
• 65
• 79

In a survey of 2480 golfers, 15% said they were left-handed. The survey's margin of error was 3%. What percent of golfers in the population could we expect to be left-handed?

• (0.18 to 0.21)

• (0.12 to 0.18)

• (0.12 to 0.15)

• (0.11 to .19)

You take a poll and find that 34% of the 100 people you asked dislike school lunches. Using a 95% confidence level, what is the margin of error?

• 0.095

• 0.047

• .034

• .34

400 randomly selected adults were sampled. The proportion of people who like ice cream was found to be 82%. Find the Margin of Error.

• 0.074

• 0.192

• 0.038

• 0.368

The 99% confidence interval for a proportion is (0.54, 0.72). What is p̂?

• 0.63

• 0.18

• 0.09

• 0.66

A sample of 30 women finds the mean height to be 62.3 in and the standard deviation to be 1.5 in. Find the 95.4% confidence interval.

• 1.699

• 0.55

• 0.537

• 19.325

A radio talk show host is interested in the proportion p of adults in his listening area who think that the drinking age should be lowered to 18. To find this proportion, he poses the following question to his listeners: “Do you think that the drinking age should be reduced to 18?” He asks listeners to phone in and vote “yes” or “no” depending upon their opinions. Of 200 people who phone in, 140 answer “yes.” Find the margin of error.

• .21

• .032

• ..065

The results of a survey suggested that 54% of the voters will vote for a particular candidate in an election. The results from 100 computer simulations of this situation are shown below. Based on the margin of error and these simulations, what is the range of the percentages of votes this candidate could receive?

• 0.38 to 0.68

• 0.48 to 0.58

• 0.54 to 0.74

• 0.59 to 0.69

A sports-and-exercise shop sampled its customer base one weekend and asked 35 customers their age. Which interval estimate of the population mean has a margin of error of 1.7 ?

•  26.0 ≤ x̄ ≤ 30.0
• 26.8 ≤ x̄ ≤ 30.2
• 33.3 ≤ x̄ ≤ 37.6
• 24.0 ≤ x̄ ≤ 46.0

A number that describes the population.

• Population
• Parameter
• Statistic
• Sample