# qnt 275

### QNT 275 Final Exam 2017 – Probability Distribution Problems

For the probability distribution of a discrete random variable x, the sum of the probabilities of all values of x must be: Equal 1 Explanation: A sum of all values in a probability distribution will always add up to 1, period. The following table lists the probability [...]Read more

### QNT 275 Final Exam 2017 – Students Suffer from Math Anxiety

The following table gives the two-way classification of 500 students based on sex and whether or not they Suffer from Math Anxiety Sex – Yes – No Male – 168 – 72 Female – 167 – 93 If you randomly select one student from these 500 students, [...]Read more

### QNT 275 Final Exam 2017 – Seven Days of Summer in Los Angeles

The temperatures (in degrees Fahrenheit) observed during seven days of summer in Los Angeles are: 78, 99, 68, 91, 107, 75, 85 The range of these temperatures is: Find the range by subtracting the smallest number from the largest. 107 – 68 39 The variance of these temperatures, [...]Read more

### QNT 275 Final Exam 2017 – Cumulative Frequency Distribution of Commuting Time

The following table gives the cumulative frequency distribution of the commuting time (in minutes) from home to work for a sample of 400 persons selected from a city. Time (minutes) f 0 to less than 10 64 0 to less than 20 153 0 to less than 30 217 0 to less than 40 283 […]Read more

### QNT 275 Final Exam 2017 – Multiple Choice Study Guide

A quantitative variable is the only type of variable that can: assume numeric values for which arithmetic operations make sense Explanation: Quantitative values are numeric, while qualitative are labels, therefore, they are the only type that can perform arithmetic operations. A [...]Read more

### Delivery time for all food orders at a restaurant during lunch hr are normally distributed…QNT 275

Quick Tutorial – Solving for Mean and Standard Deviation Delivery time for all food orders at a restaurant during lunch hr are normally distributed with a mean of 8.1 min and SD of 4.6 min let x bar be the mean delivery time for a random sample of 30 orders. Calculate the [...]Read more

### QNT 275 Final Exam Section 1 – Variable to Predict another Variable

What is the name of the variable that’s used to predict another variable? Explanatory Explanation: An explanatory variable, sometimes called a predictor, is a special type of independent variable that is used to measure another variable. An example of this an action is a study [...]Read more

### QNT 275 Final Exam Section 2 – Item Most Influenced by Outliers

Which of the following is most influenced by outliers? Mean Explanation: The mean will be the most affected from a single ore small number of outliers. For this reason, the mean is usually not the best measure of central tendency when the distribution is skewed or not [...]Read more

### QNT 275 Final Exam Section 3 – Continuous Random Variable

Which of the following can be represented by a continuous random variable? The average temperature in Tampa, Florida, during the month of July Explanation: A continuous random variable can take an infinitely large range of values. The average temperature can accept any value [...]Read more

### QNT 275 Final Exam Section 4 – Stratified Random Sample

Which of the following meets the requirements of a stratified random sample? A population contains 10 members under the age of 25 and 20 members over the age of 25. The sample will include two people chosen at random under the age of 25 and four people chosen at random over 25. [...]Read more