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Chi-square test for independent attributes.
On the most recent tax cut proposal, a random sample of democrats and republicans in the Congress cast their votes as follows:
Democrats: Favor = 85 Oppose = 78 Abstain = 37
Republicans: Favor = 118 Oppose = 61 Abstain = 25
Are the opinions on the tax cut proposal independent of party affiliation? Use a = 0.01
Assume a sample of 25 women is needed for the study. What type/s of method/s of random selection can you use to determine which women should be asked to participate in the study?
In general, when the dependent variable is neither interval nor ratio in level of measurement -- i.e., is not numeric -- a nonparametric statistical test is required to test the null hypothesis.
If alpha level is changed from a = 0.05 to a = 0.01. What occurs to boundaries for critical region?
Four different paints are advertised as having the same drying time. To check the manufacturer's claims, five samples were tested for each of the paints.
Find a 90% confidence interval for the mean decibel level µ for this type of transit vehicle.
Use the Poison distribution to find the indicated probabilites. Find the probability of 6 dandelions in an area of 1 m ²
No information is available about its value. How large a sample size is needed to estimate it to within 0.15 with 99% confidence?
The standard deviate of fresh fruit consumption is about 30 pounds. Suppose a researcher took a random sample of 38 people and had them keep a record of the fresh fruit they ate for one year.
Use the normal distribution to approximate the desired probability. Find the probability that in 200 tosses of a fair die, we will obtain at exactly 30 faces.
A manufacturer claims that he makes light bulbs each of which has a 0.9 probability of operating successfully when plugged in.
What fraction of the calls last between 4.2 and 5 minutes?
Of the estimated natural gas reserves in North America, 4.59 *10^9 m ^3 are in United States. 2.66*10^9 m^3 are in Canada, and 1.99*10^9 m^3 are in Mexico.
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