/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Q. AP1.8 Here are the IQ scores of 10聽ra... [FREE SOLUTION] | 91影视

91影视

Here are the IQ scores of 10randomly chosen fifth-grade students:

Which of the following statements about this data set is not true?

a. The student with an IQ of 96is considered an outlier by the 1.5xIQRrule.

b. The five-number summary of the 10IQ scores is 96,118,123.5,130,145.

c. If the value 96were removed from the data set, the mean of the remaining 9IQ scores would be greater than the mean of all 10IQ scores.

d. If the value 96were removed from the data set, the standard deviation of the remaining 9IQ scores would be less than the standard deviation of all 10IQ scores.

e. If the value 96were removed from the data set, the IQR of the remaining 9IQ scores would be less than the IQR of all 10IQ scores.

Short Answer

Expert verified

(a) The statement about the data set is true.

(b) The statement about the data set is true.

(c) The statement about the data set is true.

(d) The statement about the data set is true.

(e) The statement about the data set is not true.

Step by step solution

01

Part (a) Step 1: Given information

We need to find whether the given statement "The student with an IQ of 96is considered an outlier by the 1.5IQRrule is true or not.

02

Part (a) Step 2: Explanation

From least to largest, order the data values:

96,110,118,118,122,125,126,130,139,145

The median is the sorted data set's middle value. Because the number of data values is even, the median is the average of the sorted data set's two middle values:

M=Q2=122+1252=123.5

The median of the data values below the median is the first quartile (or at 25 percent of the data). The first quartile is the third data value since there are five data values below the mean.

The median of the data values above the median is the third quartile (or at seventy-five percent of the data). The third quartile is the third data value above the mean, and hence the 3+5=8thdata value, because there are five data values above the mean.

Because 96 is less than hundred, the 1.5xIQR rule considers it an outlier, and hence assertion (a) is TRUE.

03

Part (b) Step 1: Given information

We need to find whether the given statement "The five-number summary of the 10IQ scores is 96,118,123.5,130,145" is true or false.

04

Part (b) Step 2: Explanation 

The minimum, first quartile, median, third quartile, and maximum are included in the five-number summary.

The minimum is 96and the highest is 145, with a median of 123.5, a first quartile of 118, and the third quartile of 130(part (a) of the result).

As a result, the five-number summary is 96,118,123.5,130,145, making statement (b) TRUE.

05

Part (c) Step 1: Given information

We need to find whether the given statement "If the value 96were removed from the data set, the mean of the remaining 9IQ scores would be greater than the mean of all 10IQ scores" is true or not.

06

Part (c) Step 2: Explanation

The mean is calculated by dividing the total of all data values by the number of data items.

The data set's smallest value is 96.

If 96is removed from the data set, we may expect the mean to rise since the data's center will grow higher when the minimum is eliminated, proving that assertion (c) is correct.

07

Part (d) Step 1: Given information

We need to find whether the given statement "If the value 96were removed from the data set, the standard deviation of the remaining 9IQ scores would be less than the standard deviation of all 10IQ scores" Is true or not.

08

Part (d) Step 2: Explanation

The standard deviation is a measurement of how much variation or spread there is in a data collection.

The data set's smallest value is 96.

If 96is removed from the data set, we expect the standard deviation to drop since the spread will reduce when the minimum is removed, and thus statement (d) is TRUE.

09

Part (e) Step 1: Given information

We need to find whether the given statement "If the value 96were removed from the data set, the IQR of the remaining 9IQ scores would be less than the IQR of all 10IQ scores" is true or not.

10

Part (e) Step 2: Explanation

The interquartile range (IQR) is a robust measure of spread, which means it is unaffected by outliers.

Part (a) tells us that 96is an outlier because it is the smallest value in the data set.

If 96is removed from the data set, we anticipate the IQR to be unaffected, as the IQR should not be influenced by the outlier, and so statement (e) is FALSE.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

A maker of fabric for clothing is setting up a new line to 鈥渇inish鈥 the raw fabric. The line will use either metal rollers or natural-bristle rollers to raise the surface of the fabric; a dyeing-cycle time of either 30or40minutes; and a temperature of either 150Cor175C. Three specimens of fabric will be subjected to each treatment and scored for quality.

a. List the factors in this experiment and state how many levels each factor has.

b. If the researchers used every possible combination to form the treatments, how many

treatments were included in the experiment?

c. List two of the treatments.

Consider an experiment to investigate the effectiveness of different insecticides in

controlling pests and their impact on the productivity of tomato plants. What is the best

reason for randomly assigning treatment levels (spraying or not spraying) to the

experimental units (farms)?

a. Random assignment eliminates the effects of other variables, like soil fertility.

b. Random assignment eliminates chance variation in the responses.

c. Random assignment allows researchers to generalize conclusions about the

effectiveness of the insecticides to all farms.

d. Random assignment will tend to average out all other uncontrolled factors such as

soil fertility so that they are not confounded with the treatment effects.

e. Random assignment helps avoid bias due to the placebo effect.

Suppose that 35% of the voters in a state are registered as Republicans, 40% as

Democrats, and 25% as Independents. A newspaper wants to select a sample of 1000

registered voters to predict the outcome of the next election. If it randomly selects 350

Republicans, randomly selects 400 Democrats, and randomly selects 250 Independents,

did this sampling procedure result in a simple random sample of registered voters from

this state?

a. Yes, because each registered voter had the same chance of being chosen.

b. Yes, because random chance was involved.

c. No, because not all registered voters had the same chance of being chosen.

d. No, because a different number of registered voters was selected from each party.

e. No, because not all possible groups of 1000 registered voters had the same chance of

being chosen.

Weekend birthdays Over the years, the percentage of births that are planned cesarean

sections has been rising. Because doctors can schedule these deliveries, there might be

more children born during the week and fewer born on the weekend than if births were

uniformly distributed throughout the week. To investigate, Mrs. McDonald and her class

selected an SRS of 73people born since1993 . Of these people, 24were born on Friday,

Saturday, or Sunday. To determine if these data provide convincing evidence that fewer than43%37 of people born since 1993were born on Friday, Saturday, or Sunday, 100simulated SRSs were selected. Each dot in the graph shows the number of people that were born on Friday, Saturday, or Sunday in a simulated SRS of 73people, assuming that each person

had a 43%chance of being born on one of these three days.

a. Explain how the graph illustrates the concept of sampling variability.

b. Based on the data from the study and the results of the simulation, is there convincing

evidence that fewer than 43%of people born since 1993were born on Friday, Saturday,

or Sunday? Explain your answer.

Do you trust the Internet? You want to ask a sample of high school students the question 鈥淗ow much do you trust information about health that you find on the Internet鈥攁 great deal, somewhat, not much, or not at all?鈥 You try out this and other questions on a pilot group of 5students chosen from your class.

a. Explain how you would use a line of Table D to choose an SRS of 5students from the following list.

b. Use line 107to select the sample. Show how you use each of the digits.

See all solutions

Recommended explanations on Math Textbooks

View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.