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Determining hypotheses.
State the appropriate null hypothesis H0 and alternative hypothesis Hain each of the following cases.
(a) A 2002 study reported that 70% of students owned a cell phone. You plan to take an SRS of students to see if the percent has increased.
(b) The examinations in a large freshman chemistry class are scaled after grading so that the mean score is 72. The professor thinks that students who attend morning recitation sections will have a higher mean score than the class as a whole. Her students this semester can be considered a sample from the population of all students she might teach, so she compares their mean score with 72.
(c) The student newspaper at your college recently changed the format of their opinion page. You take a random sample of students and select those who regularly read the newspaper. They are asked to indicate their opinions on the changes using a ?ve-point scale: -2 if the new format is much worse than the old, -1 if the new format is somewhat worse than the old, 0 if the new format is the same as the old, +1 if the new format is somewhat better than the old, and +2 if the new format is much better than the old.
Interpret the estimated tolerance intervals and the confidence interval in the context of the situation related to the exercise.
What is the sample proportion, p 5 proportion of contacts that resulted in a sale being made? For simple random samples of this size, what is the probability that p # 0.10?
a. How many different 3-course meals can be ordered from this menu? (Draw a tree diagram to help visualize this sample space; or use the counting rule to find the total number of meals.)
Test the hypothesis that smoking and lung cancer are independent. Use the 1 percent level of significance.
Thus, the first question he examines is as follows: Is there a difference in the number of points students earned on their educational statistics pretests and posttests?
use a significance level of a0.05 to test the claim that p1p2. use the given sample sizes and numbers of successes to
a simple random sample of 120 clocks yields nine clocks with errors in assembly.a. compute the 99 confidence interval
Correlation of partial scores from one administration of one test - construct a frequency distribution table
the probability of getting a defective widget is .10. you select five widgets for the national widget championship.a.
SAT verbal scores are normally distributed with a mean of 423 and a standard deviation of 91. Use the Empirical Rule to determine what percent of the scores lies between 423 and 514.
Our first week together provides an overview of the organ systems. Choose 3 organ systems and complete a Venn diagram illustrating the relationship of the chosen organ systems. List at least 4 functions of each organ system in each circle. The ove..
a large tank of fish from a hatchery is being delivered to a lake. the hatchery claims that the mean length of fish in
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