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1. Which of the following is not a characteristic of normal probability distribution?
a. mean , median and the mode are equal b. mean of the distribution can be negative , zero or positive c. distribution is symmetric d. standard deviation must be 1
2. A uniform probability distribution is a continuous probability distribution where the probability that the random variable assumes a value in any interval of equal length is
a. different for each interval b. same for each interval c. at least one d. none of these alternatives is correct
The lifetime of a light bulb is an Exponential RV with a mean of 800 hours. Let L represent the time (in hours) that one randomly selected light bulb will burn. What is the possibility the light bulb burns for more than 1000 hours.
Give a possible description why serum cholesterol values for older males are lower than for younger males and reverse is true for females.
Compute the two groups using Paired sample t-test. Compute which modification reduced the number of traffic accidents
Compare your best difference to the result from an ordinary two-sample t-test between these groups. Comment the difference.
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
Suppose you had flipped a fair coin 19 times and "tails" had come up each time. The probability of now tossing a "head" on the 20th flip would then be:
To sketch the 3-sigma X-bar chart and R-chart parameters. A candy bar manufacturer desires to set up a variables control chart for the net weight of its candy bars.
Based on the equation of the least-squares line, we use software to predict the average number of home runs hit per game per team for the year 2001. We obtain the following.
At.01 significance level, can we conclude that 30-year mortgage rate for small banks is less than 6%? Evaluate the p-value.
Is there evidence to suggest a difference in the mean waiting times at the four body shops?
An experiment is designed using three levels of ground clutter and two filter types. The experiment is performed by randomly selecting a treatment combination
To determine whether there exists mean difference among the groups:
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