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A poll found that 38% of male voters and 46% of female voters support a particular candidate. To test whether this candidate has equal levels of support between male and female voters, the null hypothesis should be:
a) H0 : pmale =pfemale
b) H0 : pmale =50 % , H0 : pfemale= 50 %
c) H0 : pmale =38 % , H0 : pfemale= 46 %
d) H0 : pmale <pfemale
The Oakland Bombers professional basketball team just missed making the playoffs last season and believes it needs to sign only one very good free agent to make the palyoffs next season.
Listed below are measured loads (in lb) on the left femur of crash test dummies used in the same cars listed in the Chapter Problem. Use a 0.05 significance level to test the null hypothesis that the different car categories have the same mean. Do..
A researcher wished to estimate the number of households with two cars. How large a sample is needed in order to be 95% confident that the sample proportion will not differ from the true proportion by more than 4%.
Key Refining decided to send a special financing plan to charge account customers having the highest 10 percent of the money charges. What is the dividing point between customers who receive the special plan and those who do not.
A seven year old study reported that women whose mothers used the drug DES during pregnancy were twice as likely to develop tissue abnormalities that might lead to cancer as women whose mothers did not take the the drug.
The rate of defects among CD players of a certain brand is 1.1%. Use the Poisson approximation to the binomial distribution to find the probability that among 240 such CD players received by a store, there is at most one defective CD player.
You've administered a standardized test of manual dexterity to two groups of 10 semi skilled workers. One of these two groups of workers will be employed by you to work in a warehouse with many fragile items.
Consider the many possible distributions of grades on a quiz in a statistics class; imagine that the grades could range from 0 to 100.
Suppose that you are conducting a survey of customer satisfaction regarding their cellular phone. If you called 11 households selected at random, what is the probability that:
Commute times: three random samples of time in minutes that commuters are stuck in traffic are shown. At anova =0.05, is there a difference in the mean times among the three cities?
They were planted in four different locations, so we will consider the field as a second factor because different soil and moisture types can also have an effect on yield. The interaction plot below was obtained.
Compare the mean for the heights of males and the mean of the heights of females in the following data. Compare the values and explain what can be concluded based on the numbers.
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