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Suppose you conduct survey asking people if they support something or if they like some product or if they watch some TV-show.
Assign your numbers for
- total number of people who participated in the survey (sample size),
- numbers of people who answered "yes" to the given question.
Calculate sample proportion and then calculate Margin of Error for Population Proportion and write down confidence interval for population proportion.
Apply confidence level 95% (z c = 1.960).
Chocolate bars produced by a certain machine are labeled with 8 oz. The distribution of the actual weights of these chocolate bars is Normal with a mean of 8.1 oz and a standard deviation of 0.1 oz. What proportion of chocolate bars weighs less th..
Using random numbers of 0.1562, 0.9821, 0.3409, 0.5594, and 0.7758, compute the time required for each of five simulated maintenance checks of the airplaine's landing gear.
Give the Z score for person who scores (a) 340, (b) 310, and (c) 260. Give the raw scores for persons whose Z score on this test are (d) 2.4, (e) 1.5, (f) o, and (g) -4.5
Please discuss an application of ANOVA that might be undertaken in a workplace. What are the 3 or more treatments? What is the response variable?
he population consists of all 15 year olds living in the attendance district of a local high school. You plan to obtain a simple random sample of 200 such residents by using the roster of the high school as the sampling frame.
What is the probability that 25% or fewer male employees will indicate that they have to pick up the slack for moms working flextime?
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds.
Fit a linear regression model for bp against sodium. Do you think this is a model with a good fit? Why?
Set up a null and alternative hypothesis to test whether this sample is falling below expectations.
Using the simple test of independence (described in the lecture), decide if the events high calorie and high fiber are independent or dependent. Show your work.
Do you think this detection bias would strengthen or attenuate the association between vegetarian diet and learning disabilities? Defend your choice briefly.
Assume if random samples of size n = 9 are selected can we say anything about the distribution of sample means.
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