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It is assumed that the time failures for an electronic component are exponentially distributed with a mean of 50 hours between consecutive failures. If one extra component is installed as a backup, what is the probability of at least one of the two components working for at least 60 hours?
question 1current weekly demand forecast for an item follows a normal distribution with a mean of 100 units with a
At 0.05 level of significance, is there evidence of significant relationship between age group and where people mainly get their news? If so, describe the relationship.
x1, x2, x3 are zero mean Gaussian random variables with STD=4. Let x1 and x2 be independent and x3= a*x1+b*x2. Find the constants “a” and “b” such that the correlation between x1 and x3 is 0.3. What is the correlation between x3 and x2?
what is the probability of selecting a sample mean of 7 or less , with a sample population of 9 and mean of 10 and a standard deviation of 3.
A researcher hypothesizes that parents with school-aged children are more probable to vote in favour of a referendum increasing public school spending than adults without school-aged children, but wonders of this relationship holds for both Democr..
If the top 15% of the test scores are usually good enough for admission to law school, find the cut off score for gaining admission.
Ace Jack had no idea whether the $100,000 he pays for training for his used car salespeople works.
Using your answers to the earlier parts of this question, explain how the sample size affects the mean and SD of the sum of a collection of random variables. Limit your answer to 2-3 sentences.
Multiple choice questions based on regression - A regression and correlation analysis resulted in the following information
Hypertensive experimental (n=100) is 14%, placebo (n=100) is 22%. Generate a 95% Confidence interval for difference in proportions of patients with hypertension between groups.
Provide an example of how an ANOVA could expand on the results of a t-test. In other words, think of an example (related to the field of psychology) in which you could use a t-test, and then note how the comparison could change if an ANOVA was use..
The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?
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