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Question: Seasonal affective disorder (SAD) is a type of depression during seasons with less daylight (e.g., winter months). One therapy for SAD is phototherapy, which is increased exposure to light used to improve mood. A researcher tests this therapy by exposing a sample of SAD patients to different intensities of light (low, medium, high) in a light box, either in the morning or at night (these are the times thought to be most effective for light therapy). All parttctpants rated their mood following this therapy on a scale from 1 (poor mood) to 9 (improved mood). The hypothetical results are given in the following table .
(a) Complete the Ftable and make a decision to retain or reject the null hypothesis for each hypothesis test.
(b) Compute Tukey's HSD to analyze the significant main effect. Summarize the results for this test using APA format.
a fair coin is tossed four times. what is the probability that the number of heads appearing on the first two tosses es
In approx. 200-250 words address the following: what were the Portuguese objectives in the exploration of the coast of west Africa? What did they accomplish? What did Columbus hope to accomplish when he set forth across the Atlantic in 1492? What ..
a study of various news home pages reports that the mean number of bad links per home page is 0.4. if the errors occur
The following table shows data on average per capita wine consumption and heart disease rate in a random sample of 10 countries.
Compute the mean, median and mode measures of central tendency for the number of years of work experience. Which measure does the best job of describing central tendency for this variable?
A random sample of the lifetime of 49 UltraIllum light bulbs has a mean of 3,960 hours and a standard deviation of 200 hours. Construct a 95% confidence interval estimate of the mean lifetime for all UltraIllum light bulbs.
the u.s. adult population by age is as follows the world almanac 2009. the data are in millions of people. age number
A cellular phone company advertises that the average age of its customers is lower than 30 years. It is known that the customer ages follow a normal distribution. A random sample of 16 of this company's customers responded as follows, when asked..
Students will write a report (APA format) describing a research study they design in their area of study ( My area of study Medicine). This report will include the introduction, Participants/sampling method, procedures, data analysis (using one of th..
A meat packer is investigating the marked mass shown on Vienna sausages. A pilot study showed a mean of 11.8kg per pack and a standard deviation of 0.7kg.
A newspaper reports that the gover- nor's approval rating stands at 65%. The article adds that the poll is based on a random sample of 972 adults and has a margin of error of 2.5%. What level of confidence did the pollsters use?
what theorem states that a distribution of sample means is approximately normally distributed if the sample size is
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