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The time it takes to complete a Sta220 term test is normally distributed with a mean of 100 minutes with standard deviation of 14 minutes. How much time should be allowed if we wish to ensure that at least 9 out of 10 students (on average) can complete it? (round to the nearest minute)
A) 115B) 116C) 117D) 118E) 119
These individuals are then examined and categorized as to whether they have a heart disorder. The observed frequencies are as follows:
Draw the complete decision tree and determine whether the product should be launched or not.
Using the menu systems, request descriptive statistics (mean, s.d. and variance) for both your original variables
Would it be reasonable to conclude that the population distribution is Poisson with a mean of 2.0?
Create a 99% confidence interval for mean overall duration of symptoms in population of individuals who used zinc lozenges.
It is asserted that a greater proportion of males (= x 1 ) contribute to charity than females (= x 2 ). A survey of male and female contributors to charity showed that of 900 males surveyed
What does a confidence interval tell us and why is it importance to use a confidence interval?
Machine which fills quart milk cartons is set up to average 32.2 oz per carton, with standard deviation of 1.2 oz. Determine probability that filled carton will contain less than 32 oz of milk?
The Weschsler IQ test has a μ =100 and a σ = 15. A vitamin company said if people took vitamin X for 30 days their IQ would improve. A simple random sample of 49 people took the vitamins for 30 days. They then took the IQ test. The mean IQ of the ..
A range of values constructed from sample data so that the parameter occurs within that range at a specified probability is:
Construct a 95% confidence interval estimate of their mean weight.
The means appear to be very close, but not the variances. At α = .05, is there a difference in variances? Show all steps clearly, including an illustration of the decision rule.
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