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For each of the following sets of data (represented by the mean and standard deviation below), identify the end-points for six standard deviation units (that is between +/- 3SD around the mean). Additionally, calculate the range from "mean-3SD" to "mean+3SD"). Draw frequency polygons for each of the four distributions (assume they are normal) with the raw scores indicated for all six of the standard deviation units. a) Mean= 15 SD= 3
b) Mean= 1,000 SD= 250
c) Mean= 75 SD= 5
d) Mean= 150 SD= 15
Estimate the indicated probability by using the normal distribution as an approximation to the binomial distribution.
Duracell Ltd claim that the life of their batteries in motorised soft toys is approximately normally distributed with a mean of 102.9 hours and a standard deviation of 16.5 hours.
The times needed to fall asleep are assumed to follow a normal distribution. The results for the two nights for the ten volunteers are shown below:
How large a sample should she take to estimate the percentage with a margin of error of no more than 4%, with 90% confidence?
Suppose the population standard deviations are not the same. At.05 significance level, is there a difference in mean waiting time?
What is the intercept for the logistic regression equation and What is a 95% confidence interval for the odds ratio
Several factors influence the value obtained for a t statistic. Some factors affect the numerator of the t statistic and others influence the size of estimated standard error in the denominator.
From past experience, a server at a restaurant knows that her tips follow a right-skewed distribution with mean $6 and standard deviation $4.
What variables will be included, and collection methods used to obtain data. What is the population, sampling method used and why it is the best. Plan for data: describe what you will do with data once you have it, include types of graphs used and..
Which of the following would be the hypothesis for testing the claim that the proportion of students at a large university who smoke is significantly different from 0.15?
High precision titanium spheres are popular components in manufacturing of ball bearings. A factory has ordered a shipment of 5000 titanium spheres from aboard. It is found that the shipment has a mean radius of 1.5 cm with a standard deviation ..
Draw a sketch of the standard normal distribution curves, one for the current process and another one for the recentered process. Label the spec limits and shade the area of the curve that corresponds to your answer.
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