### Create a StudySoup account

#### Be part of our community, it's free to join!

Already have a StudySoup account? Login here

# Exam 2 Statistics Study Guide STAT 110 001

USC

GPA 3.6

### View Full Document

## 336

## 2

## Popular in Introduction to Statistical Reasoning

## Popular in Statistics

This 6 page Study Guide was uploaded by Haley Johnson on Monday March 14, 2016. The Study Guide belongs to STAT 110 001 at University of South Carolina taught by Wendy Cimino in Spring 2016. Since its upload, it has received 336 views. For similar materials see Introduction to Statistical Reasoning in Statistics at University of South Carolina.

## Similar to STAT 110 001 at USC

## Reviews for Exam 2 Statistics Study Guide

### What is Karma?

#### Karma is the currency of StudySoup.

#### You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 03/14/16

Exam 2 Review Statistics 110, Spring 2016 Questions 1 – 6 are based on the following description: In an experiment on human reaction times, a subject is asked to depress a button whenever a light flashes. Her reaction times for n=15 trials are (in milliseconds): 117 122 89 93 107 90 129 90 100 98 100 155 186 109 125 1. What is the mean reaction time? A) 114 Add all of the numbers and divide by how many numbers there is. B) 171 C) 1710 D) 125 2. What is the median reaction time? A) 125 Put numbers in order from least to greatest B) 123.5 and determine the number in the middle which will equal your median. C) 107 D) 93 3. What is the third quartile of the reaction times? A) 125 B) 123.5 C) 107 D) 93 4. What is a possible value of the standard deviation of the reaction times? A) – 229 B) 0 C) 27 D) 229 5. What is a possible reason why the median and the quartiles are appropriate measures of center and spread for the reaction times? A) The reaction times contain possible outliers B) The distribution is symmetric C) The standard deviation is greater than 0 D) The mean and the median are equal 6. What type of graph can be used to show the distribution of the reaction times? A) Pie Chart B) Pictogram Page 1 of 6 Exam 2 Review Statistics 110, Spring 2016 C) Histogram D) Bar Graph Questions 7 – 9 are based on the following description: The scores on a mid-term exam in a certain statistics class were normally distributed with a mean of 76 and a standard deviation of 4. 7. What percentage of the scores are greater than 76? A) 50% B) 68% C) 95% D) 99.7% 8. Approximately what percentage of the scores are between 72 and 84? A) 68% B) 81.5% C) 84% D) 95% 9. For this statistic class, one of the requirements for exempting the final exam was to have a mid-term exam score at or above the 93rd percentile. What was the minimum score a student needed on the mid-term exam to qualify for the final exam exemption? A) 82 B) 80 C) 70.4 D) 50 Questions 10 – 11 are based on the following description: A study was conducted to examine the effects of weight and alcohol consumption on blood pressure. A questionnaire was used to collect the data, and alcohol consumption was measured by asking the subjects to indicate “yes” if they consumed any alcohol on an average day and “no” if they consumed no alcohol on an average day. 10. In this study, A) Weight is a quantitative variable and alcohol consumption is a categorical variable B) Weight is a categorical variable and alcohol consumption is a quantitative variable C) Weight and alcohol consumption are both quantitative variables D) Weight and alcohol consumption are both categorical variables The people are just answering yes and no in alcohol consumption and so no numbers where as weight is the number. 11. One subject was told that his blood pressure was at the 30th percentile. This means that Page 2 of 6 Exam 2 Review Statistics 110, Spring 2016 A) 70% of the blood pressure readings are less than this subject's blood pressure B) 30% of the blood pressure readings are less than this subject's blood pressure C) This subject's blood pressure is greater than the median blood pressure D) This subject's blood pressure is equal to the first quartile of the blood pressure readings Questions 12 – 14 are based on the following description: The following histogram shows the distribution of the number of pages in the 112 books in a student's eBook reader. 0 200 400 600 800 1000 Number of Pages 12. What is the shape of the distribution? A) Right Skewed The graph is more on one side. More on B) Left Skewed left=right and More on right=left C) Roughly Symmetric D) Perfectly Symmetric 13. Approximately how many books have more than 799 pages? A) 51 B) 32 C) 23 D) 9 14. Approximately what proportion of the books have between 400 and 599 pages? Page 3 of 6 Exam 2 Review Statistics 110, Spring 2016 A) 0.12 B) 0.21 C) 0.27 D) 0.50 Questions 15 – 17 are based on the following description: The boxplot below depicts the ages of patients at a medical clinic on a particular day. 15. The first quartile of the ages is between A) 40 and 50 B) 30 and 40 C) 25 and 45 D) 10 and 20 16. What percentage of the patients were younger than 45? A) 25% B) 50% C) 75% D) 90% 17. About 75% of the patients were at least how old? A) 15 B) 20 C) 30 D) 45 Page 4 of 6 Exam 2 Review Statistics 110, Spring 2016 Questions 18 – 19 are based on the following description: Refer to the normal density curve below. 62 64 66 68 70 72 74 18. What is the mean of this distribution? A) 70 B) 68 C) 66 D) 34 19. What statement best describes the relationship between the mean and the median of this distribution? A) The mean is greater than the median. B) The mean is less than the median. C) The mean and the median are equal. D) The mean is located to the left of the median. Questions 20 – 21 are based on the following description: A couple purchases a foreclosed property for $50,000 and spends an additional $27,000 fixing up the property. They feel that they can resell the property for a profit of $43,000 with probability 0.15, for a profit of $23,000 with probability 0.45, for a profit of $3,000 with probability 0.25, and for a loss of $13,000 with probability 0.15. 20. Why is this a valid probability model? A) All probabilities are between 0 and 1. B) All probabilities are between 0 and 1, and the sum of all probabilities is 1. C) The outcomes are mutually exclusive. D) The outcomes are independent. 21. What is the expected profit for reselling the house? A) $15,000 B) $15,600 Page 5 of 6 Exam 2 Review Statistics 110, Spring 2016 C) $19,500 D) $77,000 Questions 22 – 23 are based on the following description: A probability experiment is conducted in which the sample space is S = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}. Each outcome is equally likely. Let event A = {2, 3, 4, 5}, event B = {1, 2, 3, 8, 9, 10}, and event C = {4, 5, 6, 7, 8, 9, 10}. 22. What collection of outcomes represents the complement of event B? A) {4, 5, 6, 7, 8, 9, 10} B) {1, 2, 3, 8, 9, 10} C) {4, 5, 6, 7} D) D) {2, 3, 4, 5} 23. Events B and C are not mutually exclusive because A) They have outcomes in common. B) They do not have outcomes in common. C) They have a different number of outcomes. D) They cannot occur at the same time. Questions 24 – 25 are based on the following description: Suppose flights at a large airport are on-time 70% of the time. Assume arrival statuses of flights are independent. To simulate the outcome of a single flight, we use the digits 3, 4, 5, 6, 7, 8, and 9 to represent an on-time flight and 0, 1, and 2 to represent a late flight. 24. Give the probability model for arrival status (whether a flight is on-time or late) at this airport. A) P(On– Time) = 0.70; P(Late) = 0.30 B) P(On– Time) = 0.68; P(Late) = 0.32 C) P(On– Time) = 0.70; P(Late) = 0.70 D) P(On– Time) = 0.70; P(Late) = 1.00 25. You select 5 flights at random and want to estimate the probability that all 5 flights are on-time. Simulate 10 repetitions, starting at line 104 of Table A (reading from left to right, starting at the beginning of the line). What is your estimate of the probability? A) 0.10 B) 0.20 C) 0.30 D) 0.40 Page 6 of 6

### BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.

### You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

## Why people love StudySoup

#### "Knowing I can count on the Elite Notetaker in my class allows me to focus on what the professor is saying instead of just scribbling notes the whole time and falling behind."

#### "When you're taking detailed notes and trying to help everyone else out in the class, it really helps you learn and understand the material...plus I made $280 on my first study guide!"

#### "I was shooting for a perfect 4.0 GPA this semester. Having StudySoup as a study aid was critical to helping me achieve my goal...and I nailed it!"

#### "It's a great way for students to improve their educational experience and it seemed like a product that everybody wants, so all the people participating are winning."

### Refund Policy

#### STUDYSOUP CANCELLATION POLICY

All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email support@studysoup.com

#### STUDYSOUP REFUND POLICY

StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here: support@studysoup.com

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to support@studysoup.com

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.