Biology Forums - Study Force

Sony would like to test the hypothesis that the average age of a PlayStation user is different from the average age of an Xbox user.
 
  A random sample of 36 PlayStation users had an average age of 34.2 years while a random sample of 30 Xbox users had an average age of 32.7 years. Assume that the population standard deviation for the age of PlayStation and Xbox users is 3.9 and 4.0 years, respectively. Sony would like to set  = 0.10. Which one of the following statements is true?
  A) Because the 90 confidence interval includes zero, we fail to reject the null hypothesis and cannot conclude that the average age of PlayStation users is different from the average age of Xbox users.
  B) Because the 90 confidence interval does not include zero, we reject the null hypothesis and can conclude that the average age of PlayStation users is different from the average age of Xbox users.
  C) Because the 90 confidence interval includes zero, we fail to reject the null hypothesis and conclude that the average age of PlayStation users is equal to the average age of Xbox users.
  D) Because the 90 confidence interval does not include zero, we fail to reject the null hypothesis and can conclude that the average age of PlayStation users is different from the average age of Xbox users.

Q. 2

If a customer at a particular grocery store uses coupons, there is a 50 probability that the customer will pay with a debit card. Thirty percent of customers use coupons and 35 of customers pay with debit cards.
 
  Given that a customer does not pay with a debit card, the probability that the same customer does not use coupons is ________.A) 0.52
  B) 0.60
  C) 0.77
  D) 0.85

Q. 3

Assume that the number of pieces of junk mail per day that a person receives in their mail box follows the Poisson distribution and averages 4.3 pieces per day. What is the probability that this person will not receive any junk mail tomorrow?
 
  A) 0.0136
  B) 0.0314
  C) 0.1069
  D) 0.1360

Q. 4

The following table represents the number of seconds that a particular web page took to load on an iPhone for 25 users along with the frequency in each class.
 
  Seconds to Load Number of Phone Users
  0 to under 5 seconds 4
  5 to under 10 seconds 7
  10 to under 15 seconds 3
  15 to under 20 seconds 10
  20 to under 25 seconds 1
 
  What is the approximate average number of seconds that this web page took to load on the iPhone?
  A) 11.9
  B) 12.5
  C) 13.7
  D) 15.0

Q. 5

One-way ANOVA requires that samples across the levels are equal to one another.
 
  Indicate whether the statement is true or false

Q. 6

The following table represents the number of minutes that 20 airline passengers had to wait in order to pass through security along with the frequency in each class.
 
  Minutes with Security Number of Passengers
  0 to under 10 minutes 4
  10 to under 20 minutes 8
  20 to under 30 minutes 5
  30 to under 40 minutes 3
 
  What is the approximate average number of minutes that a passenger waits to pass through security?
  A) 14.0
  B) 15.5
  C) 17.0
  D) 18.5

Ans. #1

A

Ans. #2

C

Ans. #3

A

Ans. #4

A

Ans. #5

FALSE

Ans. #6

D