6A-C Review Prob/Stat

6A To determine if the prop. or his first serve is worse than 0.54, Billy took 100 first serves and found 0.35 were successful. Is this evidence that Billy's first serve is successful less than the 54% of the time he claims?

• Yes, the result of 0.35 is unlikely to occur by chance

• Yes, the result of 0.35 is likely to occur by chance

• No, the result of 0.35 is unlikely to occur by chance

• No, the result of 0.35 is likely to occur by chance

Tags

CCSS.HSS.IC.B.4

6A: A study chose 663 registered voters at random after an election. 72% said they had voted in the election. Records show that only 56% of registered voters voted in the election. What is the population of interest?

• 663 registered voters

• 72% said they voted

• 56% that voted

• All registered voters

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

6A: A study chose 663 registered voters at random after an election. 72% said they had voted in the election. Records show that only 56% of registered voters voted in the election. Which of the following statements is true about these percentages

• 72% and 56% are both statistics

• 72% is a statistic and 56% is a parameter

• 72% is a parameter and 56% is a statistic

• 72% and 56% are both parameters

Tags

CCSS.HSS.IC.B.3

6B The true variance of the population of all respondents to a survey was 2. Which of the following is a true statement?

• It is an unbiased estimator if the mean of the sample distribution is around 4

• It is not an unbiased estimator if the mean of the sample distribution is around 2

• It is an unbiased estimator of population if the mean of the sample distribution is around 2

• It is an unbiased estimator of population if the median of the sample distribution is around 2

Tags

CCSS.HSS.ID.A.4

6C At a high school, 85% of students are right-handed. Let X = the number of students who are right-handed in a random sample of 10 students from the school. Which statement about the mean and standard deviation of the sampling distribution is true?

• μx = 8.5; σx ≈ 1.129

• μx = 8.5; σx ≈ 0.113

• μx = 8.5; σx ≈ cannot be determined from the information given.

• Neither the mean nor the standard deviation can be determined from the information given.

6C At a high school, 92% of students are right-handed. Let X = the number of students who are right-handed in a random sample of 100 students from the school. Will the sampling distribution of X be approximately Normal?

• Yes, np and n(1-p) are at least 10

• No, np is not at least 10

• No, n(1-p) is not at least 10

• No, np and n(1-p) are not at least 10

6C At a high school, 88% of students are right-handed. Let X = the number of students who are right-handed in a random sample of 100 students from the school. What is the probability of getting a sample where at least 95 students are right-handed?

• 0.98

• 0.02

• 0.06

• 0.94

Tags

CCSS.HSS.ID.A.4