Unit 4 Day 3 Warm-Up

If you flip a coin 40 times and get heads every time.  What is the likelihood of flipping a tails the 41st time? 

• 1/41
• 40/41
• 1/2

Tags

CCSS.HSS.CP.A.2

CCSS.HSS.CP.A.3

As the number of trials increases the experimental probability approaches the theoretical/true probability.

• Yes

• No

• Sometimes

The ratio of tails after 2,000,000 flips with be closer to .5 than 1,000,000 flips.

• Yes

• No

• Maybe

A statistician calculates the probability of an event in an experiment. After a dozen trials of the experiment, the statistician finds that the theoretical probability and the experimental probability differ. What is the likely reason for this?

• The statistician hasn't completed enough trials of the experiment.
• The statistician made an error in their calculations.
• The statistician made an error in constructing their experiment.
• The statistician has completed too many trials of the experiment.

You toss a coin 100 times, and it lands on heads every time. What is the probability it will land on tails the 101st toss?

• 1/101
• 1/100
• 1/2
• 1/5

Tags

CCSS.HSS.CP.A.2

CCSS.HSS.CP.A.3

A family has 7 children, all girls, and they really want a boy. Some people think they should try again because the “law of averages" is going to kick in and the chance that they will have boy is really high while other people think this particular family has the same chance (50%) of having an 8th girl. Who is right?

• "Law of Averages" group
• 50% Group
• Neither
• Both

Tags

CCSS.HSS.CP.A.2

CCSS.HSS.CP.A.3

The mean life of a tire is 30,000 km. The standard deviation is 2000 km.

Then, 68% of all tires will have a life between ___________ km and __________ km.

•  28,000 km and 32,000 km.
• 24,000 km and 34,000 km.
• 26,000 km and 34,000 km.
• 27,000 km and 31,000 km.

Tags

CCSS.HSS.ID.A.4

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 residual plots from five different least squares regression lines are shown below. Which of the plots shows the strongest evidence that its regression line is an appropriate model for the data and is consistent with the assumptions required for inference for regression?

• 
• 
• 
• 
• 

Tags

CCSS.HSS.ID.A.3

What is the interquartile range (IQR)?

• 4
• 64
• 60
• 8

Tags

CCSS.HSS.ID.A.2

CCSS.HSS.ID.A.3