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The makers of a soft drink want to identify the average age of its consumers. A sample of 16 consumers is taken. The average age in the sample was 22.5 years with a standard deviation of 5 years. Assume the population of consumer ages is normally distributed.
a. Using the confidence interval method, test the claim that the average age of consumers is at least 30 years ( α= 0.05).b. Test the same claim by using the test statistics method ( Z or T test).c. Test the same claim by using the P-Value method ( Z or T test).
Compute the indicated confidence interval for the differenciate in proportions. Suppose that the samples are independent and that they have been randomly selected.
Day are 0.49, 0.39, 0.08, and 0.04, respectively. Find the standard deviation for the probability distribution. Round answer to the nearest hundredth.
Find the best predicted temperature (in degree F) at a time when a cricket chirps 3000 times in one minute. What is wrong with this predicted value?
The frequency distribution below shows the distribution for suspended solid concentration (in PPM) in river water of 50 different waters collected in September 2011.
If a sample of 30 people selected from 300, find the probability that the mean will be less than 156 pounds using the correction factor.
Composite functions are useful when one quantity depends on a second quantity, and in turn that second quantity depends on a third quantity. This is an extremely general situation with lots of real-world applications.
The table below shows the scores of a group of 15 students in mathematics and art: Determine if the locations of distribution of scores for these students differ significantly for the two subjects. Use the hand calculation method and then use PHSta..
What is the 95% confidence interval estimate of the population mean examination score if a sample of 200 applications provided a sample mean ? (4%)
The faculty members at Boise State University were surveyed on the question "How satisfied were you with the Summer 2002 Schedule?" Their responses were to be categorized as "very satisfied," "somewhat satisfied," "neither satisfied nor dissatisfi..
A survey covering 0 different suburbs in Dallas found the average price of gasoline to be $3.924 per gallon with a population standard deviation of $0.053. What critical value shoiuld be used to test the claim using a = 0.01?
The undergraduate grade point average (GPA) for students admitted to the top graduate business schools was 3.37 (Best Graduate Schools, U.S. News and World Report, 2001).
What if the number of debilitating network viruses detected in a day at the firewalls of an Internet service provider within a certain geographic region is fueling a possible management decision to upgrade the detection system.
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