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The half width of a 99% confidence interval for a mean based on sample size of 30 is 10. What is the value of the sample standard deviation? Give your answer to 2 decimal places.
a marketing firm is studying consumer preferences for winter fashions in four different months. from a population of
question consider the following set of sample data78 121 143 88 110 107 62 122 130 95 78 139 89
a company that sells an online course aimed at helping high-school students improve their sat scores has claimed that
The sample sizes are unequal. Research question: Are the mean annual attendance rates the same for employees in these three departments?
Estimate the proportion of customers that will be using food stamps at his store. How large a sample is required to estimate the true proportion to within 3% with 98% confidence?
A federal report find that a lie detector test given to truthful persons have a probability of 0.2 of suggesting that the person is deceptive. A company asks 12 job applicants to take a lie detect test. Suppose that all 12 applicants answer truthf..
the number of calls received by a phone operator at an emergency department between 10-11am has a poisson distribution
Findout probabilities utilizing standard normal distribution. If the debt is normally distributed with a standard deviation.
What statistical procedure was used to analyze data in study B, how many groups were compared in study B, how many subjects were enrolled in Study C and which study demonstrated the greatest level of statistical significance?
All welders in a factory begin as apprentices. Every year the performance of each apprentice is reviewed. Past records indicate that after each review, 10% of the apprentices are promoted to professional welder
If 3 different factor levels show a lot of variation between levels this implies:
Someone gives you 10 to 1 odds that you cannot roll a double number with the roll of a pair of dice. You win $10 if you succeed and you lose $1 if you fail. What is the expected value of the game for you? What can be expected if you play 100 times..
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