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Determine the range of values containing 50% of the population of x. From a large sampling (N>5000), we find that x has a mean value of 5.2 units and a standard deviation of 1.0 units. Assume x is normally distributed.
The management of discount furniture, a chain of discount furniture stores in the northeast, designed an incentive plan for salespeople. To evaluate this innovative plan, 12 Salespeople were selected at random
Compute Pearson's correlation coefficient between age and amount spent on this particular product.
Among 9 electrical components exactly one is known not to function properly. If 3 components are randomly selected, find the probability that all selected components function properly.
The radius of the hole and the radius of the shaft. Let the random variable X denote the clearance, in millimeters. The probability density function of X is?
What is dispersion? Briefly name five measures of dispersion. Describe the characteristics of the standard deviation. Explain
A random sample of 15 paired observations has a correlation of -.46. Can we conclude that the correlation in the population is less than zero? Use the .05 significance level.
A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least 925 hours. A random sample of 39 light bulbs has a mean life of 905 hours with a standard deviation o 55 hours.
If gambler rolls two dice and gets sum of four, he wins $10; and if he gets sum of three, he wins $25. Cost to play game is $5. What is expectation of this game?
Z score on comparison distribution for sample score and your conclusion. Suppose that all population are normally distributed.
Evaluate the difference in the mean ratings and find the standard deviation of the difference in the ratings, what is the chance both children are boys?
How would your colleagues probably react to such a statement of yours? Is their expected (positive or negative) reaction the local cultural habit in your company or is it a wider position common for people in your country?
At 0.01 significance level is it sensible to conclude that modification reduced number of traffic accidents?
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