Quizizz - Lesson 14

. The number of letters received in the mail over the past week is recorded.

2, 3, 5, 5, 5, 15

Which value appears to be an outlier?

• 2

• 3

• 5

• 15

. Elena collects 112 specimens of beetle and records their lengths for an ecology research project. When she returns to the laboratory, Elena finds that she incorrectly recorded one of lengths of the beetles as 122 centimeters (about 4 feet).

What should she do with the outlier, 122 centimeters, when she analyzes her data?

• Leave it in and continue with her calculations

• Correct it before doing calculations

What is the Interquartile Range (IQR)?

• 5

• 6

• 7

• 11

Which of the following could be considered an outlier and why?

• 18

  Because it is more than 3 times the median larger than Q3

• 18

  Because it is more than 1.5 times the IQR larger than Q3

• 21

  Because it is more than 3 times the median larger than Q3

• 21

  Because it is more than 1.5 times the IQR larger than Q3

Are there any outliers below the median? Why?

• No

  Because if you go 1.5 times the IQR lower than Q1 you get into negative numbers and time can't be negative.

• Yes

  Because some numbers are 3 times the median lower than Q1.

• Yes

  Because some numbers are 1.5 times the IQR lower than Q1.

Are there any outliers? Explain how you know

• Yes

  Because there are numbers that are more than 3 times the median larger than Q3

• Yes

  Because there are numbers more than 1.5 times the IQR larger than Q3

• No

  Because there are not any numbers more than 3 times the median larger than Q3

• No

  Because there are not any numbers that are more than 1.5 times the IQR larger than Q3

Use the mean and standard deviation to compare the scores of the two groups.

• The mean shows that the FIRST group scored higher and had LESS variability according to the standard deviation.

• The mean shows that the SECOND group scored higher and had LESS variability according to the standard deviation.

• The mean shows that the FIRST group scored higher but had MORE variability according to the standard deviation.

• The mean shows that the SECOND group scored higher and had MORE variability according to the standard deviation.

The minimum score required to get an in-person interview is 33.

Which group do you think has more people get in-person interviews and why?

• SECOND GROUP

  Because the minimum score is 33 and they have a mean of 34.1 with a standard deviation of 0.5, so the bulk of their scores had to be above 33.

• FIRST GROUP

  Because the minimum score is 33 and they have a mean of 35.3. Their standard deviation of 3.6 means all of their scores had to be above 33.

A group of pennies made in 2018 are weighed. The mean is approximately 2.5 grams with a standard deviation of 0.02 grams.

Interpret the mean and standard deviation in terms of the context.

• There are probably a lot of pennies that weigh over 2.7 grams.

• There will not be many pennies that weigh about 2.5 grams.

• Most of the pennies weigh about 2.5 grams.

• There will be several pennies that weigh less than 2.0 grams and more than 3.0 grams.

What is the MEDIAN of the data?

• 1

• 1.5

• 2

• 5