Unit 9 Stats Quiz

What is the formula for calculating z-score?

• (X - μ) * σ

• (X / μ) - σ

• (X - μ) / σ

• (X + μ) / σ

In a normal distribution, what percentage of data falls within one standard deviation of the mean?

• 68%

• 75%

• 90%

• 50%

Tags

CCSS.HSS.ID.A.4

How many different ways can you arrange the letters in the word 'MATH'?

• 16

• 24

• 12

• 20

What is the mean of a standard normal distribution?

• 1

• 0

• 0.5

• 2

Tags

CCSS.6.SP.A.3

What is the z-score for a data point that is 2 standard deviations above the mean?

• 1

• 2

• 4

• 3

What is the difference between permutations and combinations?

• Permutations involve selecting objects with a specific order, while combinations involve selecting objects without any order.

• Permutations involve selecting objects without considering the order, while combinations involve arranging objects in a specific order.

• Permutations and combinations are the same concept.

• Permutations involve arranging objects in a specific order, while combinations involve selecting objects without considering the order.

What is the standard deviation of a standard normal distribution?

• 2

• 0.5

• 1

• 3.14

If you have 5 different colored balls and you want to choose 2, how many different combinations can you make?

• 10

• 7

• 15

• 3

What is the empirical rule in normal distribution?

• The empirical rule in normal distribution is the 80-90-100 rule.

• The empirical rule in normal distribution is the 60-90-120 rule.

• The empirical rule in normal distribution is the 68-95-99.7 rule.

• The empirical rule in normal distribution is the 50-75-100 rule.

Tags

CCSS.HSS.ID.A.4

What is the probability of getting a head when flipping a fair coin?

• 0.25

• 0.5

• 0.75

• 1

Tags

CCSS.7.SP.C.5