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A normally distributed random variable Y has std dev. = 800. A random sample of 100 observations was taken from Y, and the sample average observed was 1400
Find the right endpoint of the symmetric 95% confidence interval for the mean?
A multiple choice quiz has 150 questions each with 5 choices and only 1 is the correct answer. What is the probability that sheer guess work yield from 30 to 40 correct answers out of the 150 questions?
A simple random sample is found to be (0.7, 2.1). Can we conclude that 90% of households have between 0.7 and 2.1 children? Justify your answer.
Normally distributed about a mean value of 580 with a standard deviation of 60. Determine what percentage of the students scored higher than 750 on the exam.
A) Please develop the Expected frequencies table based on the above information.
ABC Manufacturing has six machines that perform particular task. Breakdowns happens frequently for this machine. Past records indicate that the number of breakdowns that happen each day is described by the probability distribution seen below:
Known that 15% of walls painted with this paint need more than 55 minutes to dry completely. Find the standard deviation of this distribution.
What are the control limits of the X chart, if α = 0.0026 and the sample size is 4 ?
suppose a study estimated the population mean for a variable of interest using a 99 confidence interval. if the width
If there are no large cost disadvantages, the data suggest that we should proceed. B) Technical issue: Does the treatment effect depend on the past average sales?
Speed of cars travelling on I-85 in Gaston County is normally distributed with average speed (µ) of 66 MPH and standard deviation (σ) of 8 MPH.
Determine odds student gets more than 14 questions correct? Determine the odds student gets exactly 12 questions correct?
A test was conducted to determine whether gender of a spokesperson affected the likelihood that consumers would prefer a new product.
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