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Hypothesis testing for difference between variances, population means and paired.
Five samples of a ferrous-type substance are to be used to determine if there is a difference between a laboratory chemical analyses and X-ray fluorescent analysis of the iron content. Each sample was split into two subsamples and the two types were applied. Following are the coded data showing the iron content analysis.
Sample
Analysis
1
2
3
4
5
X-ray (B)
2.0
2.3
2.1
2.4
Chemical (A)
2.2
1.9
2.5
Assuming the measurement system has a normal distribution, test thetwo-sided test of hypothesis for a) H0: σA2 = σB2 at α =0.05,
b) H0: μB -μA= 28% at α =0.1
c) Suppose it is desired to test the hypothesis that the differences rather than the individual measurement are of importance, (that is D=B-A, that is: μD = μB -μA), then let:
H0: μD=10%, H1: μD < 10%
Test the hypothesis. Will you reject or not reject the null hypothesis at α = 0.05
Compare the additional revenue Circuit City makes as it moves from 2 million to 4 million copies of Vista with the additional revenue it makes as it moves.
Solve the given equation on the interval 0 ≤ θ ≤ 2π.
Short Description on Credit risk analysis of the different bonds and explain why you would pay more or less for their bonds
Illustrate what has presidents immediately under the principles of immediate wants of the nation also mandate from the people.
She has bids from several companies in order to install (1) Wi-Fi, or (2) a switched Ethernet 100 Base T network. She wishes you to provide her some sense of relative performance of the alternatives so that it may be related to the costs of each o..
You are told to produce a quantity that maximizes profit. How many units do you produce and what is your profit? How many machine and labour hours are used in production?
Arbitrarily choose someone from sample. Determine the probability that they are Jewish and Democrat?
The government has decided to reduce the pollution also from now on will require a pollution permit for each ton of pollution emitted.
Find the probability of committing a type I error.
The firm is considering a movement of the plant to Shenzen, China where labour is cheaper. The same mathematical relationship between inputs and outputs will hold.
Categorize the following as discrete or continuous random variables.
Test the claim that the mean age of the prison population in one city is less than 26 years. Sample data are summarized as n = 25, x = 24.4 years, and s = 9.2 years. Use a significance level of α = 0.05.
By using 0.05 level of significance, is there any evidence of difference in mean life of bulbs produced by two kinds of machines?Calculate p-value and interpret its meaning.
Evaluate true mean delivery time to within 5 minutes at 90% reliability level? Suppose that standard deviation for delivery times is 18.2 minutes.
She is interested in testing the null hypothesis that the mean SAT score is the same for each type of schooling using the one-way ANOVA. Some summary statistics for the three groups are given below, followed by the one-way ANOVA table.
The sample information is reported below. At the .10 significance level can we conclude that there is a difference in the amounts quoted?
Develop appropriate hypotheses such that rejection of H0 will support the researcher's contention.
If campaign can be expected to also to rise the probability of best case scenario to 0.4, is it a good investment.
The sample proportion of large gloves for each location is and . (Round your answers to 4 decimal places.)
Compute a 3-month moving average forecast of demand for April through January (of the next year).
To test whether there is significant mean difference between two groups using independent sample t test.
What is the chance that stock will fall by more than 15% next month? What extra assumption are you making when replying this question?
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