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In a large statistics course, it has been historically found that 30% of all students receive either an A or B ; 40% receive a c ; and 30% receive a D or lower. one class of 40 students complain that they were harshly graded in the examination as l0 students received A or B ; 17 received a C ; and the rest received a D or lower.
QUESTION: Is the class's complain about harsher grading justified? ( use a : 0.05 )
When using past data, I have found that the proportion of items rejected by quality control personnel is about 3%. We normally make 5000 items per day. For a p chart, what are the upper and lower control limits?
Using an investment game, the study demonstrated that people who inhaled oxytocin were more likely to give their money to a trustee compared to people who inhaled an inactive placebo. For this experimental study, identify the independent variable ..
A real estate broker hoped to develop an equation that could be used to predict the sales price of homes in a certain suburb. It seemed to him that the most important variable
The firm has already decided that any sample mean below 78 or above 82 will signal the workers that the process is not working properly.
Infer that the difference in the level of satisfaction with service between the two branches.
What is the arithmetic mean selling price?
In each of the following cases, decide whether or not a binomial distribution is an appropriate model, and give your reasons.
SmartPeople is an organization that only admits people with IQ's in the top 98 percentile. What IQ score would a person need to be a member of SmartPeople?
Find the linear regression model for the South Central states. How does the equation for the South Central states compare to the one you found for the North Central states?
The average number of typos on one page of a manuscript is 8. What is the probability that 4 to 6 type appear on 2 pages of the manuscript? Imagine Poisson distribution.
How many individuals will it need to sample to achieve this level of accuracy and confidence?
We are certain the the average difference in reaction times between the two light types for all golfers is between 0.27 and 7.13.
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