quiz decision science

docx

School

Riverside City College *

*We aren’t endorsed by this school

Course

Subject

Statistics

Date

Apr 3, 2024

Type

docx

Pages

Uploaded by freecommonsense2012

Deleting the grid lines in a table and the horizontal lines in a chart -increases the data-ink ratio. A quantity of interest that can take on different values is known as a(n) -variable The correlation coefficient will always take values -between –1 and +1. DJ needs to display data over time. Which of the following charts should he use? -Line chart Which one of the following is used in predictive analytics? -Linear regression Compute the relative frequencies for the data given in the table below: Grades Number of students A 16 B 28 C 33 D 13 Total 90 0.18, 0.31, 0.37, 0.14 A manager of a fast food restaurant wants the drive-thru employee to ask every fifth customer if he or she is satisfied with the service. Who makes up the population? -All customers who use the drive-thru window of this fast food restaurant Natalie needs to compare the number of employees by job title for the last five years. Which of the following charts should Natalie use?

-Clustered column chart A _____________ is a graphical presentation of the relationship between two quantitative variables. -scatter chart What is the mode of the data set given below? 35, 47, 65, 47, 22 --47 Compute the 50th percentile for the following data. 10, 15, 17, 21, 25, 12, 16, 11, 13, 22 ---15.5 One of the 4 Vs of big data that refers to uncertainty due to data inconsistency and incompleteness, ambiguities, latency, deception, and model approximations is -Veracity A two-dimensional graph representing the data using different shades of color to indicate magnitude is called a -heat map. A sample of 13 adult males’ heights are listed below. 70, 72, 71, 70, 69, 73, 69, 68, 70, 71, 67, 71, 74

Find the range of the data. --7 A summary of data that shows the number of observations in each of several nonoverlapping bins is called a(n) -frequency distribution Which of the following is a discrete random variable? -The number of times a student guesses the answers to questions on a certain test Given that P(A) = 0.3, P(A | B) = 0.4, and P(B) = 0.5, compute P(A and B). -0.2 Which of the following statements is correct? -The binomial distribution is a discrete probability distribution and the normal distribution is a continuous probability distribution. A game at an arcade is in the form of a large wheel that a player spins. The wheel is programmed to give 2 tickets 50% of the time, 5 tickets 25% of the time, 10 tickets 23% of the time, and 100 tickets 2% of the time. If a player spins the wheel once, what is the expected number of tickets the player will win? -6.55 Participants at the state fair were given eight rings to toss. The number x of rings tossed onto a stick can be approximated by the probability distribution in the table. Use the probability distribution to find the mean of the probability distribution. 0 0.01

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

1. 0.03 2 0.07 3 0.07 4 0.10 5. 0.21 6 0.32 7. 0.13 8. 0.06 ---5.14 The __________ probability distribution can be used to estimate the number of vehicles that go through an intersection during the lunch hour. -Poisson Two events are independent if --P(A | B) = P(A) or P(B | A) = P(B).

Which statement is true about mutually exclusive events? -If events A and B cannot occur at the same time, they are called mutually exclusive. An experiment consists of determining the speed of automobiles on a highway by the use of radar equipment. The random variable in this experiment is a -continuous random variable. The newest model of smart car is supposed to get excellent gas mileage. A thorough study showed that gas mileage (measured in miles per gallon) is normally distributed with a mean of 75 miles per gallon and a standard deviation of 10 miles per gallon. What is the probability that, if driven normally, the car will get 100 miles per gallon or better? ----1 – NORM.DIST(100, 75, 10, TRUE) A statistics teacher started class one day by drawing the names of 10 students out of a hat and asked them to do as many pushups as they could. The 10 randomly selected students averaged 15 pushups per person with a standard deviation of 9 pushups. Suppose the distribution of the population of number of pushups that can be done is approximately normal. What is the standard error of the mean? -2.876 Which of the following is NOT a characteristic of the normal probability distribution? -The standard deviation must be 1. The contingency table below represents employees of a communications company classified by age and field of expertise. What is the probability that a randomly selected employee age 35-44 years old has business expertise?

- 0.3674 The newest model of smart car is supposed to get excellent gas mileage. A thorough study showed that gas mileage (measured in miles per gallon) is normally distributed with a mean of 75 miles per gallon and a standard deviation of 10 miles per gallon. What value represents the 50th percentile of this distribution? -75 What is the total area under the normal distribution curve? -1 If correlation between two variables is near 0, it implies that -the variables are not linearly related. Scores on Ms. Bond's test have a mean of 70 and a standard deviation of 11. Michelle has a score of 48. Convert Michelle's score to a z -score. (Round to two decimal places if necessary.) - -2 Which of the following is not a characteristic of the normal probability distribution? - standard deviation m,ust be 1 The __________ shows the number of data items with values less than or equal to the upper class limit of each class. -cumulative frequency distribution A survey conducted by a research team was to investigate how the education level, and age are related to annual income. The regression output based on the sample data is given below. Predict the annual income of an employee, who is 39 years old, and has got 19 years of education. - $130,665.07 A statistics teacher started class one day by drawing the names of 10 students out of a hat and asked them to do as many pushups as they could. The 10 randomly selected students averaged 15 pushups per person with a standard deviation of 9 pushups. Suppose the distribution of the population of number of pushups that can be done is approximately normal. What is the standard error of the mean?

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

- 2.846 Compute the median of the following data. 32, 41, 36, 24, 29, 30, 40, 22, 25, 37 -31 In the probability table below, which value is a marginal probability? Completed Obstacle Course Level No Yes Total Challenging 0.4 0.3 0.7 Easy 0.1 0.2 0.3 Total 0.5 0.5 1.0 - .5 Which statement is NOT true? -Failing to reject the null hypothesis when it is false is a Type I error The __________ is a measure of the error that results from using the estimated regression equation to predict the values of the dependent variable in the sample. -sum of squares due to error (SSE) Given that P(A) = 0.3, P(A | B) = 0.4, and P(B) = 0.5, compute P(A or B). - .6 What would be the coefficient of determination (R-square) if the sum of squares due to error (SSE) is 13.26 and the sum of squares due to regression (SSR) is 10.03? - .43

A simple random sample of 31 observations was taken from a large population. The sample mean equals 5. Five here is a - point estimate The charts that are helpful in making comparisons between categorical variables are -bar charts and column charts Below is a histogram for the number of days that it took QwD Accounting to perform audits in the last quarter of last year. What is the relative frequency of the 25-28 bin? - 1

quiz decision science

Related Documents