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A magazine published a study on the ammonia levels near the exit ramp of a highway tunnel. Daily ammonia concentrations on eight random days:
1.53
1.50
1.34
1.51
1.57
1.41
1.40
1.47
a. Find the range of the ammonia levels.
The range is
b. Find the variance of the ammonia levels.
c. Find the standard deviation.
assume that the population of heights of male college students is approximately normally distributed with mean m of
How are the goals of the tests similar and different? How are the tests used? What are the purposes of giving these differing tests?
Suppose that 20% of the population has high blood pressure. If 7 people are randomly selected off the street, what is the probability that more than 4 of them do not have high blood pressure?
sketch a histogram showing the population distribution - locate value of the population mean in your sketch and make an estimate of the standard deviation.
The sample mean, the sample proportion and the sample standard deviation are all unbiased estimators of the corresponding population parameters. True or false (please provide a solution or explanation).
A recent national survey found that high school students watched an average (mean) of 6.8 videos per month. A random sample of 36 college students revealed that the mean number of videos watched last month was 6.2
The combined production level should not exceed 1200 units per month. The demand for product II is no more than half the demand for product I.
A consumer watchdog organization wants to see whether Bank N in the northern part of a state has a higher default rate than Bank S in the southern part of that same state.
Suppose a stock analyst wants to determine whether there is a difference in the mean rate of returns for three types of stock - utility, retail, and banking.
bcs quality assurance programme chooses a random sample of 50 units and finds that 12 are defective. what is the number
At the bottom of each model write the role that each variable plays in the model (i.e. dependent variable (DV), independent variable (IV), moderator, and mediator).
A coin-operated coffee vending machine dispenses, on the average, 6 oz of coffee per cup. Can this statement be true of a vending machine that occasionally dispenses only enough to fill the cup half full (say, 4 oz)?
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