Q1
Given below are the values taken from a normal population.
21 23 25 27 28 35 30 32 33
Determine a 95% confidence interval for the population variance .
A.
Q2
Suppose a random sample of 100 U.S. companies taken in 2005 showed that 21 offered high-deduct
Q1
Use the method specified to perform the hypothesis test for the population mean, at a significance level of ? =0.01. A university is interested in promoting
graduates of its honors program by establishing that the mean GPA of these graduates exceeds 3.
Q1
1. Use the method specified to perform the hypothesis test for the population mean, at a significance level of ? =0.01. A university is interested in
promoting graduates of its honors program by establishing that the mean GPA of these graduates exceeds
Q1
A psychologist would like to examine the effects of a new drug on the activity level of animals. Three samples of rats are selected with n = 5 in each
sample. The rats in the first sample serve as a control and do not get any of the drug. The rats in t
Q1
3.0 Points Binomial Distribution. Surveys repeatedly show that about 40% of adults in the U.S. indicate that if they only had one child, they would prefer it to be
a boy. Suppose we take a random sample of 25 adults. (For this problem it is best to use
Q1
A sociologist wishes to determine whether there is a relationship between the sex of a person and the amount of alcohol consumed. A random sample of 100
people is selected and the following data are obtained.
Alcohol consumption
Total
Sex
Low
Moderate
Q1
Normal Distribution Problem. Anyone with a personal business must make estimated tax payments four times over the year. An analysis of income tax returns
from the previous year indicates that for a particular income classification, the amount of money
Q1
Stats Question:
1. It is said that people who are engineering majors, pass certification at a rate of roughly 65%. A research organization selected a random sample of 200
engineering majors and found that 115 had passed certification. Based on the samp
Q1
Find the indicated probabilities.
One in four people in the U.S owns individual stocks. You randomly select 12 people and ask them if they own individual stocks. Find the probability that the
number who say they own individual stocks is
(a) exactly two
Q1
1. At the time she was hired as a server at the Grumney Family Restaurant, Beth Brigden was told, You can average $81 a day in tips. Assume the
population of daily tips is normally distributed with a standard deviation of $3.46. Over the first 43 days
Q1
field researcher is gathering data on the trunk diameters of mature pine and spruce trees in a certain area. The following are the results of his random
sampling. Can he conclude, at the 0.10 level of significance, that the average trunk diameter of a
Q1
1. In January 2011, The Marist Poll published a report stating that 66% of adults nationally think licensed drivers should be required to retake their road test
once they reach 65 years of age. It was also reported that interviews were conducted on 1,0
Group A Questions
Question #4
A politician claims that he is supported by a clear majority of voters. In a recent survey, 28 out of 43
randomly selected voters indicated that they would vote for the politician. Use a 10% significance level
for the test. U
Q1
*PLEASE ANSWER IF YOU ONLY 100% SURE OF YOUR ANSWERS! THANK YOU FOR YOUR HELP!:)
Answer the following questions based on the scenario given below:
To check on a weight requirement for a shipment of apples, 30 apples were selected at random from the shi
Q1
A coffee manufacturer is interested in whether the mean daily consumption of regular-coffee drinkers is less than that of decaffeinated-coffee drinkers. Assume
the population standard deviation for those drinking regular coffee is 1.33 cups per day and
Group C Questions
Ch. 7 Q 1
Consider the following hypotheses:
H0: = 330
HA: 330
The population is normally distributed with a population standard deviation of 69. Use
Table 1.
Critical Value
The Value of |Z a| at LOS 0.01% is 2.58
a. Use a 1% level of si
Q44
The manufacturer of an MP3 player wanted to know whether a 10 percent reduction in price is
enough to increase the sales of its product. To investigate, the owner randomly selected eight
outlets and sold the MP3 player at the reduced price. At seven r
Q1
3. A paired T-test was performed to test the null hypothesis H0: ?D = 0 versus the alternative H1: ?D ? 0. The observed test statistic is t = 1.8, based on a
random sample of size 18. At the .05 significance level the null hypothesis is:
A) rejected
B)
Q1
A. The length of time it takes for Gandolf's fireworks to explode after they are launched is presumed to be uniformly distributed. If the length of time it takes
them to explode occurs over the interval of 10 to 25 seconds, inclusive, then what is the
Group B Questions:
Ch. 4 Q 1
A basketball player is fouled while attempting to make a basket and receives two free throws. The
opposing coach believes there is a 36% chance that the player will miss both shots, a 14% chance that
he will make one of the sh
Q1
The production department of Celltronics International wants to explore the relationship between the
number of employees who assemble a subassembly and the number produced. As an experiment, 3
employees were assigned to assemble the subassemblies. They
Q.
An article suggests that a Poisson process can be used to represent the occurrence of structural loads
over time. Suppose the mean time between occurrences of loads is 0.5 year.
(a) How many loads can be expected to occur during a 2-year period?
(b) Wh
Prob & Stat - 300
Mr. Dooley
Chapter 3 Review
NAME:_
1.)
An ordinary die is thrown once. If a 1 or 6 appears, a ball is drawn from urn A, otherwise a
ball is drawn from urn B. Urn A contains 3 red marbles, 2 white marbles and 1 blue marble. Urn B
contains
Prob & Stat - 300
Mr. Dooley
Final Chapter 3 Review
NAME:_
1.) In a batch of 50 CDs 10% are defective. If 3 cds are randomly selected without replacement
what is the probability of at least 1 being defective.
2.) In a lottery bin, there are 20 ping pong n