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Q1) From practical point of view, what is difference between a frequency distribution and relative frequency distribution? Why is cumulative relative frequency distribution so much more informative that just relative frequency distribution? Use examples to explain these differences.
Q2) Researcher wants to know whether or not individuals are more likely to help in emergency when they are indoors than when they are outdoors. Of 28 participants who were outdoors, 19 helped and 9 did not. Of 23 participants who were indoors, 8 helped and 15 did not. Enter these data and determine if helping behaviour is agented by environment. The key to this problem is in data entry (hint: how many participants were there and what do you know about each participants?
Test to see if the mean cell phone bill has changed since 2004. Use a .05 level of significance for the test.
Do 1-sample t-test to see if people in Chicago have travelled to fewer states than people nationwide. Utilize the 10% (.10) level of significance.
The Central Limit Theorem states that the sampling distribution of means is:
The average age of the students in the sample was 23 with a standard deviation of 3.5: a) Formulate the hypotheses for this problem.
Analysis of data sets assignment
Construct a 98% prediction interval for the selling price of a 4l- year old house having 4500 square feet, 13 rooms, and an attached garage.
Find the area under the normal distribution curve between z = 1.52 and z = 2.43.
What should the cut-off score be for the interviews? (Round to nearest whole number).
Which of the given is the example of a discrete random variable? Which of the given is an example of continuous random variable?
There are two telephone lines A and B. Let E1 be the event that line A is being used and E2 be the event that line B is being used
A manufacturer of 35-mm cameras knows that a shipment of 30 cameras sent to the large discount store contains 8 defective cameras. The manufacturer also knows that the store will choose two of the cameras at a random, test them, and accept the shi..
What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence?
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