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Question: Write the null and alternative hypotheses for each of the following examples. Determine if each is a case of a two-tailed, a left-tailed, or a right-tailed test.
a. To test if the mean amount of time spent per week watching sports on television by all adult men is different from 9.5 hours
b. To test if the mean amount of money spent by all customers at a supermarket is less than $105
c. To test whether the mean starting salary of college graduates is higher than $39,000 per year
d. To test if the mean waiting time at the drive-through window at a fast food restaurant during rush hour differs from 10 minutes
e. To test if the mean hours spent per week on house chores by all housewives is less than 30
one environmental group did a study of recycling habits in a california community. it found that 70 of the aluminum
For the passengers in the SRS, what is the approximate probability that the mean length of time for them to get through security will be less than 18 minutes?
In a test of the reliability of products produced by two machines, machine 1 produced 10 defective parts in a run of 200, while machine 2 produced 15 defective parts in a run of 260. Test the claim that proportion of defectives produced by machine..
1.do students tend to improve their sat mathematics sat-m score the second time they take the test? a random sample of
If the sample mean lifetime of the 100 batteries were 36.7 hours. would you find the manufacturer's claim plausible? Explain.
Ten percent of the members of a particular bowling league are widowed. If 20 bowling league members are selected at random, A) Find the probability that 10 or more will be widowed.
Suppose that f(x, t) is the probability of getting x successes during a time interval of length t when (i) the probability of a success during a very small time interval from t to t + ?t is α · ?t, (ii) the probability of more than one success dur..
a) Test whether there is a difference between attitudes in the 2 cities. Use a 95% alpha. b) What does your result say about attitude consistency across cities?
find a formula for the probability distribution of the random variable x representing the outcome when a single die is
Can a pretest on mathematics skills predict success in a statistics course? The 82 students in an introductory statistics class took a pretest.
Test the hypothesis that no more than 85% of the Canadian athletes use supplements. State the two hypotheses, the test statistic, and P-value.
the data below are yields for two different types of corn seed that were used on adjacent plots of land. assume that
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