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X is a random variable that represents ph of arterial plasma, the mean of the x distribution is 7.4. a random sample of 33 patients with arthritis took the drug for 3 months blood test showed an average of pH to be Xbar=8.1 with sample standard deviation s=0.6. Use a 5% level of significance to test the claim that the drug has changed(either way) the mean pH level of the blood.
To determine whether two categorical variables are independent, one should use the:
Carry out a Z test using the five steps hypothesis testing with a two-tailed test at the .05 significance level, and make a drawing of the distributions involved.
What is the P-value of the test, assume the standard deviation is 3 years, a 95% confidence interval for the average time
If the limits of the confidence interval of the difference between the means of two normally distributed populations were 3.5 and 5.5 at the 95% confidence level, then we can conclude that we are 95% certain that there is a significant difference ..
The number of children, x, belonging to each of eight families registering for swimming was 2, 2, 2, 4, 2, 1, 2, 2. Find the mean, x. (Give answer correct to 2 decimal places.)
In light of these data, are the percentages of divorcing couples with prenuptial agreements equal in these four places?
Briefly discuss probability distributions. What is a normal distribution? Please provide a written example of how 'understanding distribution' can be an asset for any business project.
The average shaft size for the E300 electric motor is .55 inch, with a standard deviation of .10 inch. It is normally distributed. What is the probability that a shaft selected at random will be between .55 and .65 inch?
Find the probability that a randomly person consumes more than 20 pounds of Ice Cream in a year. If 36 people are selected at random and the average consumption is calculated, find the probability that the mean is less than 16 lbs.
Consider an acceptance-sampling scheme in which factory takes delivery of a batch of components if random sample of 400 components contains fewer than M defectives.
You decide to predict gasoline prices in different cities and towns in the U.S. for your term project. Your dependent variable is price of gasoline per gallon and your explanatory variables are per capita income
Standard deviation of 30 lb. Find the percentage of such weights between 190 lbs and 225 lbs. among 400 men aged 18 to 74, how many are expected to weigh between 190 lbs and 225 lb.
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