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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.
If you choose an employee at random, then find the probability that the employee received training and became a productive salesperson and became a productive salesperson
If a group of 81 children is selected at random, what is the probability that the average time these children watch television is more than 3.5 hours a day?
Determine the average number of parts waiting to be worked on, the percentage of time the operator is working, and the percentage of time the machine is idle.
In relation to this problem how would you try to develop a frequency distribution with five classes for these data? In relation to this problem how would you, Try to Develop a histogram based on the frequency distribution.
Consider the following exponential probability density function: This number represents the time between arrivals of customers at the drive-up window of a bank.
a sample of temperatures of initiating a certain chemical reaction yielded a sample average degrees celcius of 84.2 and
individuals filing federal income tax returns prior to march 31 received an average refund of 1056. consifer the
Find a 95% confidence interval for the true proportion of all medical students who plan to work in a rural community.
If 25 loads are chosen at random for a weight check, find the probability that the mean weight of those loads is less than 44.24 tons. Assume that the variable is normally distributed.
You can just switch on the heater of your swimming pool / sauna / living room etc. But if you want to be calculate what time you should switch it on
a physics lab instructor wants to estimate the time required for physic students to complete a required experiment.
a local drugstore owner knows that on average 100 people per hour stop by his store. find the probability that in a
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