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In testing the equality of the two means below, what is the test statistic? (Use the unequal variances formula)
Sample 1 Sample 2
Sample size 9 12
Sample mean 80 115
Sample variance 550 100
A) -4.20 B) -2.31 C) -0.18 D) -0.50
In a random sample of 10 adults from a nearby county, the mean waste generated per person per day was 4.35 pounds and the standard deviation was 1.88 pounds.
Which of the following models are appropriate to forecast a time series whose amplitude increases over time?
Merta reports that 74% of its trains are on time. A check of 60 randomly selected trains shows that 38 of them arrived on time. Find the probability that among the 60 trains 38 or fewer arrive on time.
At a 5% level of significance, is there evidence to conclude that the mean life is different from 375 hours?
One use of the Chi-square goodness of fit test is to determine if specified multinominal probabilities in the null hypothesis is correct.
The owner of a local golf course wanted to determine the average age of the golfers that played on the course. In a random sample of 30 golfers that visited his course, the sample mean was 48.34 and the standard deviation was 9.327. Calculate a 90..
In a paragraph explain the differences between the Independent Samples and Paired Samples T-Test. When do you use each? Purpose a research question that could be addressed using each test
The data is shown on the table. Is there a difference in mean SBP between treatments? Run the appropriate test at α= 0.05
Using the following number of flirtations actions in the 4 hour period, test the "null hypothesis'
A major problem resulting from the lack of randomization in a cohort study is: the possibility that a factor that led to the exposure, rather than the exposure itself, might have caused the disease.
The consequences of the central limit theorem is that if we end up averaging the measurements of a particular quantity, the distribution of an average tends on going toward a normal one?
The new Lucky Lady Casino wants to increase revenue by providing buses that can transport gamblers from other cities. Research shows that these gamblers tend to be older, they tend to play slot machines only, and they have losses with a mean of $1..
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