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A machine produces parts with lengths that are normally distributed with ? = 0.59. A sample of 19 parts has a mean length of 76.26.
a) Find the 90% confidence maximum error of estimate for ?. (To 3 decimal places.)
b) Find the 90% confidence interval for ?. (To three decimal places.)
Lower Limit
Upper Limit
Determine estimated average starting salary for school with average GMAT of 600 points?
Suppose the waiting time at a restaurant is normally distributed with a mean of 12 minutes and a standard deviation of 6 minutes.
For these 4 questions below what would be the independent and dependent variables, the level of measurement and whether or not the variable is discrete or continuous.
How would you use the concept of probabilities to apply to profiles for hiring more satisfied individuals?
The standard deviation is estimated to be 0.279. Use the 99% level of confidence.
Assume that the class has 60 students and that the examination period is 90 minutes in length. How many students do you expect will be unable to complete the exam in the allotted time.
The average expenditure on Valentine's Day was expected to be $100.89 (USA Today,| February 13, 2006). Do male and female consumers differ in the amounts they spend?
Find the probability distribution for X defined as the number of defective items drawn (Hint: You have to find P(X=0), P(X=1) and P(X=2). You may have to use both multiplicative and additive rules to find P (X=1)).
Suppose Z has a standard normal distribution with a mean of 0 and standard deviation of 1. The probability that Z is less than -2.20 is.
Based on your analysis, how is the new bottling process working?
Determine pearsons correlation coefficient and comment on the value obtained. Obtain a regression equation representing the above data. Estimate the production batch size for a direct labour cost of R350-00.
Estimating the individual score using normal distribution and find the minimum SAT score needed to be accepted?
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