College Algebra

Introduction to Statistics

Statistics

Trigonometry

Question 1 of 25 4.0/ 4.0 Points Identify the slope and the y-intercept of the equation: y = 5x + 4    A. None of these.    B. slope = 5; y-intercept is (0, 4)    Feedback: Correct! The slope-intercept equation of a line (y - mx + b) is an easy way to the identify the slope and y-intercept.    C. slope = 4; y-intercept is (- 5, 0)     D. slope = - 5; y-intercept is (4, 0)    E. slope = 4; y-intercept is (0, - 5)  Part 2 of 25 - Default: 4.0/ 4.0 Points Question 2 of 25 4.0/ 4.0 Points Choose the location of the point (0, 7)      A. Quadrant I    B. Quadrant II    C. Quadrant III    D. Quadrant IV    E. Negative y-axis    F. Positive y-axis   Feedback: Correct! If a point is on the positive y-axis, the first coordinate is zero and the second coordinate is positive.    G. Negative x-axis    H. Positive x-axis Rationale: Part 3 of 25 - Default: 4.0/ 4.0 Points Question 3 of 25 4.0/ 4.0 Points In which quadrant does the point (- 13, - 13) lie?      A. Quadrant I    B. Quadrant II    C. Quadrant III    D. Quadrant IV Part 4 of 25 - 0.0/ 4.0 Points Question 4 of 25 0.0/ 4.0 Points The equation of a line is 6x - 8y =  24. The intercepts should be written as ordered pairs - in parentheses and with a comma between the coordinates. It's x-intercept is:  4   It's y-intercept is -3     Part 5 of 25 - 4.0/ 4.0 Points Question 5 of 25 4.0/ 4.0 Points The equation of a line is y = - 16. Its intercepts are:    A. x-intercept: (- 16, 0) y-intercept: (0, - 16)    B. x-intercept: (- 16, 0) y-intercept: There is no y-intercept    C. x-intercept: There is no x-intercept. y-intercept: (0, - 16)    D. x-intercept: (- 16, 0) y-intercept: (0, 0) Part 6 of 25 - 4.0/ 4.0 Points Question 6 of 25 4.0/ 4.0 Points The point A is located on the y-axis, 6 units above the x-axis. What are the coordinates of point A?    A. (6, 0)    B. None of these    C. (0, -6)    D. (0, 6)   Feedback: Correct! The first coordinate tells you how many units you are to the left or right of the y-axis and the second coordinate tells you how many units you are above or below the x-axis.    E. (-6, 0) Part 7 of 25 - 4.0/ 4.0 Points Question 7 of 25 4.0/ 4.0 Points You are at coordinates (2, 3). If you go straight left 6 units, and then straight up 2 units, what will your new coordinates be? Your new coordinates will be  (-4,5)  .   Part 8 of 25 - 4.0/ 4.0 Points Question 8 of 25 4.0/ 4.0 Points A line parallel to the x-axis is called a horizontal  line.  Part 9 of 25 - 4.0/ 4.0 Points Question 9 of 25 4.0/ 4.0 Points If (a, 13) is a solution of the equation y = 2x - 5, what is a?    A. a = 1

MATH | 110 | College Algebra | exam | Question 1 of 25 4.0/ 4.0 Poin

MATH 302 WEEK 1 TEST Part 1 of 5 - Section: Data & Sampling 2.0/ 5.0 Points Question 1 of 20 0.0/ 1.0 Points What kind of data is &quot;the colors of the cars around the gym&quot; in the scenario? A study was done to determine the age, the number of times per week, and the duration (amount of time) of residents using a local gym in San Antonio, Texas. The first car in the parking lot was selected randomly, and then the resident of every eighth car in the lot around the gym was interviewed.    A. Quantitative Discrete  B. Quantitative Continuous  C. Qualitative Answer Key:C Comment:Qualitative Question 2 of 20 0.0/ 1.0 Points A group of test subjects is divided into 10 groups; then 3 of the groups are chosen at random. What type of sampling is used?  A. Cluster  B. Convenience  C. Stratified  D. Systematic    E. Simple Random Answer Key:A Comment:Cluster Question 3 of 20 1.0/ 1.0 Points What was the sampling method that was used in the scenario? A study was done to determine the age, the number of times per week, and the duration (amount of time) of residents using a local gym in San Antonio, Texas. The first car in the parking lot was selected randomly, and then the resident of every eighth car in the lot around the gym was interviewed.  A. simple random  B. cluster    C. systematic  D. stratified Answer Key:C Question 4 of 20 0.0/ 1.0 Points A market researcher polled every eighth person who walks into a grocery store. What type of sampling was used?  A. Cluster  B. Stratified    C. Simple Random  D. Systematic  E. Convenience Answer Key:D Comment:Systematic Question 5 of 20 1.0/ 1.0 Points What is the sampling method used in the following scenario? A teacher wants to know if her students are doing homework, so she randomly selects rows one and four and then calls on all students in row one and all students in row four to present the solutions to homework problems to the class.  A. convenience  B. stratified    C. cluster  D. simple random  E. systematic Answer Key:C Part 2 of 5 - Section: Statistics, Probability and Key Terms 5.0/ 5.0 Points Question 6 of 20 1.0/ 1.0 Points A Priest is interested in the proportion of couples who stay married after he marries them. Identify the sample:  A. all the couples the priest marriages    B. a subgroup of couples the priest marriages  C. the proportion of the sample of the priest's couples who stay married  D. the proportion of all couples who stay married Answer Key:B Question 7 of 20 1.0/ 1.0 Points An APU instructor is interested in the mean number of days an APU statistic students are absent from class during a quarter. The instructor’s sample produces a mean number of days absent of 5 days. This value is an example of a:

MATH | 302 | Statistics | assessment | MATH 302 WEEK 1 TEST Part 1 of

follow an exponential distribution. What is the probability that the tires will fail within two years of the date of purchase?    A.  0.8647    B.  0.2212    C.  0.4866    D.  0.9997 Answer Key:C Feedback: P(x < 2) In Excel, =EXPON.DIST(2,1/3,TRUE ) Question 8 of 20 0.0/ 1.0 Points Suppose that the longevity of a light bulb is exponential with a mean lifetime of eight years. Find the probability that a light bulb lasts between six and ten years.    A.  0.1175    B.  0.1859    C.  9.6318    D.  0.3034    E.  0.3682 Answer Key:B Feedback: P( 6 < x < 10) P(x < 10) - P( x < 6) In Excel, =EXPON.DIST(10,1/8,TRUE)- EXPON.DIST(6,1/8,TRUE) Question 9 of 20 1.0/ 1.0 Points The average lifetime of a certain new cell phone is three years. The manufacturer will replace any cell phone failing within two years of the date of purchase. The lifetime of these cell phones is known to follow an exponential distribution. What is the median lifetime of these phones (in years)?    A.  5.5452    B.  1.3863    C.  0.1941    D.  2.0794 Answer Key:D Feedback: Median Lifetime is the 50th percentile. Use .50 in the equation and the rate of decay is 1/3 Part 5 of 6 - The Uniform Distribution Questions 0.0/ 6.0 Points Question 10 of 20 0.0/ 1.0 Points The waiting time for a bus has a uniform distribution between 0 and 10 minutes. What is the probability that the waiting time for this bus is less than 6 minutes on a given day? Answer: (Round to two decimal place.)   Answer Key:0.6 | .6| 0.60|.60 Feedback: Interval goes from 0  x  10 P(x < 6) =  Question 11 of 20 0.0/ 1.0 Points Miles per gallon of a vehicle is a random variable with a uniform distribution from 25 to 35. The probability that a random vehicle gets between 28 and 33 miles per gallon is: Answer: (Round to twp decimal place)   Answer Key:0.50|.50 Feedback: Interval goes from 25 < x < 35 P(28 < x < 33) =  Question 12 of 20 0.0/ 1.0 Points The waiting time for a taxi has a uniform distribution between 0 and 10 minutes. What is the probability that the waiting time for this taxi is less than 7 minutes on a given day? Answer: (Round to two decimal place.)   Answer Key:0.70|.70 Feedback: Interval goes from 0 < x < 10 P(x < 7) =  Question 13 of 20 0.0/ 1.0 Points A local grocery delivery time has a uniform distribution over 0 to 60 minutes. What is the probability that the grocery delivery time is more than 15 minutes on a given day? Answer: (Round to 2 decimal places.)   Answer Key:0.75|.75 Feedback: Interval goes from 0 < x < 60 P(x > 15) =  Question 14 of 20 0.0/ 1.0 Points The mail arrival time to a department has a uniform distribution over 0 to 60 minutes. What is the probability that the mail arrival time is more than 20 minutes on a given day? Answer: (Round to 2 decimal places.)   Answer Key:0.67|.67 Feedback: Interval goes from 0 < x < 60 P( 20 > x) =  Question 15 of 20 0.0/ 1.0 Points The waiting time for a table at a busy restaurant has a uniform distribution between 0 and 10 minutes. What is the 95th percentile of this distribution? (Recall: The 95th percentile divides the distribution into 2 parts so that 95% of area is to the left of 95th percentile) _______ minutes Answer: (Round answer to one decimal place.)   Answer Key:9.5

MATH | 302 | Statistics | exam | follow an exponential distribu

Stats_Final.docx.docx-Stats Final Nicholas Jackson MATH302 September

(30/45)*(29/44)*(28/43)*(27/42)*(26/41)*(25/40)*(24/39)*(15/38)*(14/37)*(1 3/36). But, this is only one way of getting 7 girls and 3 boys. There are lots of other ways of getting 7 girls and 3 boys; namely, 10C3 ways. So we have to multiply the above probability by this number of combinations. This yields the same .2904 that you arrive at using the form

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