Z-Scores, Samp. Prop & Marg of Error 11/2 #2

The average waist size for teenage males is 29 inches with a standard deviation of 2 inches. 
If waist sizes are normally distributed, determine the z-score of a teenage male with a 33 inch waist.  

• 2
• 1
• -2
• -1

Tags

CCSS.HSS.ID.A.4

The z-score represents.....

• the amount of standard deviations a data value is above or below the mean.
• the percentile the data value is above or below the mean.
• the amount of standard deviations a data value is above or below the median.
• the percent the data value is above or below the mean.

Tags

CCSS.HSS.ID.A.4

Mean of 70, standard deviation of 8 and X value = 54 . Find the z score

• 2.

• -2

• 5

• -1

If I have a positive z-score, I scored ABOVE or BELOW the mean?

• ABOVE

• BELOW

Tags

CCSS.HSS.ID.A.4

Brian scored an 78 on a Chemistry Exam. The average on the exam was a 68, with a standard deviation of 5. What is Brian's z-score?

• 2

• -2

• 1

• -1

Joanne's Z-score is -1. What does this mean?

• She didn't take the test yet.

• She scored 1 standard deviation below the average.

• She did better than most people.

• No clue

A survey of 400 people is done, what is the approximate margin of error.

• 5%

• 3.1%

• 20%

• 10%

Tags

CCSS.HSS.IC.B.4

A recent survey found that 77% of high schoolers use their phones more than 4 hours a day on average. The margin of error was 3%. What is the interval for which we could expect to find the truth of the population?

• 77% - 80%

• 74% - 77%

• 74% - 80%

• 50 million high schoolers - 120 million

Tags

CCSS.HSS.IC.B.4

CCSS.HSS.IC.A.1

A recent survey of 2000 high schoolers found that 80% use their phones more than 4 hours a day on average. What is the interval for which we could expect to find the truth of the population?

• 2%

• 78% - 82%

• 93% - 97%

• 82%

Tags

CCSS.HSS.IC.B.4

CCSS.HSS.IC.A.1

A research team surveys 1001 adults, asking them how many hours they work per week. What is the margin of error for this survey?

• 3%

• 32%

• 63%

• 9%

Tags

CCSS.HSS.IC.B.4