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The mean length of time, per week, that students at a certain school spend on their homework is 24.3 hours, with a standard deviation of 1.4 hours. Assuming the distribution of study times is normal, what percent of students spend more than 25 hours per week on homework?
Perform a significance test to assess whether there is an association between mortality from cirrhosis of the liver and duration of employment in the group hired after 1945. Report a p- value.
Describe the role of postsynaptic potentials (excitatory and inhibitory), synaptic transmission, and receptors in producing and regulating behavior.
A random sample of eight adults aged 30 years were asked how much they spent on medical costs in the year 2011. The following data were measured. Compute the sample standard deviation.
Estimate a probability that a seed from new plant will germinate a random sample of 3000 seeds, of those seeds 2430 germinated. What is the sample space for this problem and does it add up tp 1? are the outcome in the sample space equally likely?
A DVD rental store wants to know what proportions of its customers are under age 21. A simple random sample of 500 customers was taken, and 375 of them were under age 21. Presume that the true population proportion of customers under age 21 is 0.6..
Determine, with 95% confidence, if the stocks from "socially conscious" companies are different from the mean P/E ratio of all other major stocks.
a large clinical trial of the effect of diet on breast cancer assigned women at random to either a normal diet or a
Compute test statistic and p -value for each sample. (Negative amount must be pointed out by minus sign.)
a researcher conducts an independent-measures study examining how the brain chemical serotonin is related to
an anova procedure is used for data obtained from five populations. five samples each comprised of 20 observations were
Tourism is one consideration for CoffeeTime's future, A survey of 1,233 visitors to mumbai last year revealed that 110 visited a small cafe during their visit.
The Complaints Department of a popular used car dealer receives most complaints about the electrical system, particularly the starter.
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