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Mandrake Falls High School is providing a weekend course in laboratory techniques to its laboratory students. Of the students enrolled in lab classes at Mandrake, have taken the weekend course. Mandrake is evaluating the course's effectiveness by having its lab instructors record harmful lab "incidents": accidents, misuse of lab equipment, etc. The contingency table below gives a summary of the data that have been gathered so far for Mandrake's lab students. Each student is classified according to whether or not he has taken the lab techniques course and how he has performed in the lab. In the cells of the table are the respective observed frequencies. Note that three of the cells also have blanks. Determine the frequencies expected if the two variables, status regarding lab techniques course and laboratory performance, are independent.
To compile the record chart it is necessary to know the correct average weekly sale to within 1% of its true value. How large a sample size is required?
Compute a 95% confidence interval for the average time spent in training per year at this firm. Develop a graph showing the data below as a frequency distribution. Note the mean and the confidence interval on the graph.
Determine new, standardized score for each of following values from original population.
Conducts a study of 50 randomly selected seniors and finds the average debt is $2995, and the population standard deviation is $1100. With alpha = 0.05, is the student senate correct?
Dogs were trained with urine samples from bladder cancer patients and people from a control group who did not have bladder cancer.
Suppose that you are conducting a survey of customer satisfaction regarding their cellular phone. If you called 11 households at random, what is the probability that every household has a cellular telephone?
A random sample of 400 observations produced a sample proportion of 0.32. What is the standard error to construct a 99.5% confidence interval.
Would it be reasonable to conclude that the population mean is 63 pounds?
The average monthly electric bill of a random sample of 256 residents of a city is $90 with a standard deviation of $24.
The population standard deviation can be assumed known as .24. What is the 95% confidence interval estimate of the mean undergraduate GPA for students admitted to the top graduate business schools.
Assume that your students are a sample of all fourth graders in your state and you can use your student data to test some ideas. What is the major problem with your assumption.
A survey of 120 high school students shows that 39 of them work over 20 hours per week during the school year. Does it demonstrate the conjecture that more than 25% of the high school students work over 20 hours per week during the school year?
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