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Harwinder singh 300984088
Ketan Kumar 300984684

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Question 1.
Suppose that we want to test the hypothesis with a significance level of .05 that the climate has changed since industrialization.  Suppose that the mean temperature throughout history is 50 degrees.  During the last 40 years, the mean temperature has been 51 degrees. Suppose the population standard deviation is 2 degrees and that the population is normally distributed.  What can we conclude?

a)    State the hypotheses

b)    State the level of significance and construct the critical interval

c)    Calculate the test statistics

d)    Make a decision

e)    State a conclusion

Question 2.
In testing hypotheses, the researcher initially assumes:

a)the alternative hypothesis is true.
b) the null hypothesis is true
c) errors cannot be made
d) the population parameter of interest is known

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Question 1.
An automobile manufacturer recommends oil change intervals of 3,000 miles. To compare actual intervals to the recommendation, the company randomly samples records of 50 oil changes at service facilities and obtains sample mean 3,752 miles. It is known that the population standard deviation is 638 miles. Determine whether the data provide sufficient evidence, at the 5% level of significance, that the population mean interval between oil changes exceeds 3,000 miles.

a)    State the hypotheses

b)    State the level of significance and construct the critical interval

c)    Calculate the test statistics

d)    Make a decision

e)    State a conclusion

Question 2.
If a business researcher has a new theory about buying habits of consumers and wants to test it, the new theory usually is formulated into the:

a) null hypothesis
b) alternate hypothesis
c) critical value
d) substantive hypothesis

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Yejin sim
Abdullah

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Question 1.
A medical laboratory claims that the mean turn-around time for performance of a battery of tests on blood samples is 1.88 business days. The manager of a large medical practice believes that the actual mean is larger. A random sample of 17 blood samples yielded mean 2.09 and sample standard deviation 0.13 day. Perform the relevant test at the 10% level of significance, using these data. Assume the population of turn-around times is normally distributed.

a)    State the hypotheses

b)    State the level of significance and construct the critical interval

c)    Calculate the test statistics

d)    Make a decision

e)    State a conclusion

Question 2.
The rejection and non rejection regions are divided by the:

a) rejection value
b) dividing point
c) critical value
d) point of no return

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Question 1.
A grocery store chain has as one standard of service that the mean time customers wait in line to begin checking out not exceed 2 minutes. To verify the performance of a store the company measures the waiting time in 30 instances, obtaining mean time 2.17 minutes with standard deviation 0.46 minute. Use these data to test the null hypothesis that the mean waiting time is 2 minutes versus the alternative that it exceeds 2 minutes, at the 10% level of significance. Assume the population of waiting times is normally distributed.

a)    State the hypotheses

b)    State the level of significance and construct the critical interval

c)    Calculate the test statistics

d)    Make a decision

e)    State a conclusion

Question 2.
When a true null hypothesis is rejected, the researcher has committed a:

a) Type II error
b) Type I error
c) rejection error
d) error in judgment

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Question 1.
Authors of a computer algebra system wish to compare the speed of a new computational algorithm to the currently implemented algorithm. They apply the new algorithm to 51 standard problems; it averages 8.16 seconds with standard deviation 0.17 second. The current algorithm averages 8.21 seconds on such problems. Test, at the 1% level of significance, the alternative hypothesis that the new algorithm has a lower average time than the current algorithm.

a)    State the hypotheses

b)    State the level of significance and construct the critical interval

c)    Calculate the test statistics

d)    Make a decision

e)    State a conclusion

Question 2.
Whenever hypotheses are established such that the alternative hypothesis is ">", then the test is a:

a) Type I test
b) two-tailed test
c) right-tailed test
d) Type II test

# data[].attributes.body
Ramneek Singh
Satvinder Pal Singh

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DIVAM JOSHI=300984102
PUSHPINDER SINGH=300981979
SIDDARTH PATHANIA=300959862
SAHIL JAGGA=300981952

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Aditya Bhanu 300986549
Abhijit Singh 300983068
Amritpal Singh 300989163

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Group 5 Jeremy Marshall 300948343, Swetha Manivannan 300983984, Mohamed Shajahan 300969224

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Group 5 Jeremy Marshall 300948343, Swetha Manivannan 300983984, Mohamed Shajahan 300969224

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Arshdeep singh 300965588
Gurwinder singh 300982016
Himanshu dang 300986169

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Arshdeep Kaur( 300985883)
Yejin Sim ( 300946577)
Abdullah Rahimi (300975351)

Question 2
(b)
We chose alternate hypothesis

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group 1: Diallo, Oumar Bachir and Ngoc Duy Nguyen

# data[].attributes.subject
group 1: Diallo, Oumar Bachir and Ngoc Duy Nguyen