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A study was performed concerning risk factors for carotid artery stenosis (narrowing) among 464 men born in 1914and residing in the city of Malmo, Sweden. The table below shows a comparison of blood - glucose (bG) levels between men with and without carotid artery stenosis (narrowing).
Perform the appropriate test for a difference in mean blood glucose and report the p-value for the two - tailed test of significance, assuming that the variances are equal.
No stenosis (n = 356)
Stenosis
Mean
sd
bG
5.3
1.4
5.1
0.8
a. 0.0001
b. 0.0256
c. 0.0623
d. 0.1576
e. 0.3523
Conduct a 3-period moving average, an exponential smoothing forecasting using an alpha of .25, and a seasonal forecast with 3 seasons.
Why can not we just do several two sample tests like we did in the last week. In your own words explain briefly also tell us what these are and what did it mean.
A recent census of a small town in Michigan showed that 60% of the residents are male, 20% have college degrees, and 15% are both male and college graduates.
What is the appropriate set of hypotheses to test such that a possible outcome of the test would indicate;
Test this conjecture with formal hypothesis test, by using a 5% significance level. Find out the p-value for hypothesis test.
On randomly selected day, let X and Y, respectively, be proportions of time that the drive-in and walk-in facilities are in use. Determine the marginal density of X.
Compute the 95% confidence interval around the mean of each of the three groups and plot the confidence interval in the space provided above.
Assume you choose 20 houses at random. On average, how many houses of twenty would you expect to have DVD? Determine standard deviation of number of houses with DVD?
What is the maximum error of estimate for p ?
Let A be the event that a randomly chosen employee has a college degree and B the event that the chosen employee's income is more than $50,000.
How many commercials' worth of data do I need to have a margin of error no more than 3, the correct set of hypotheses
Below are the sample times in minutes. At the .05 significance level, can we conclude that there is a difference in their mean times?
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