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Ophthalmology Retinitis pigmentosa (RP) is a hereditary ocular disease in which patches of pigment appear on the retina, potentially resulting in substantial vision loss and in some cases complete blindness. An important issue is how fast the subjects decline. Visual fields is an important measure of area of vision which is measured in degree ^ 2. The visual field for normal person is around 11,000 degrees ^ 2. The longitudinal data in table 11.31 were provided by an individual patient. Suppose the rate of change of In (visual field) is a linear function of follow-up time.
Question:
What does the intercept mean in this context? What is the estimated percent decline in visual field per year?
Find out the least-squares regression line and interpret its slope.
List all samples of 3 and compute the mean of each sample. Compute the mean of the distribution of sample means and population mean. compare the two values
The manager is concerned that sales are slipping, after taking into account the average value of sales for four consecutive Saturdays being $4800.
According to the Internal Revenue Service, the mean tax refund for the year 2007 was $ 2,708. Assume the standard deviation is $ 650 and tha the amounts refunded follow a normal probability distribution.
Heights of men on a baseball team has a bell-shape distribution with a means of 173 cm and a standard deviation of 9 cm. Using the empirical, rule what is the approximate percentage of the men between the following values?
A university found that 20 percent of its students withdraw without completing the introductory statistics. Assume that 20 students registered for the course.
Determine the probability distribution associated with these data.
Using symbols mention null hypothesis and alternative hypothesis.
Thirty homes responded, and the sample mean water use per day was 77 gallons with a standard deviation of 9.0 gallons per day.
Assume that 13 % of the population of the U.S. is left-handed. If a random sample of 180 people from the U.S. is chosen, approximate the probability that fewer than 26 are left-handed.
For each of the following situations, indicate the appropriate measure, incidence rate or prevalence rate and the numerical value of the rate.
What is your null hypothesis? What is your alternative hypothesis? What your decision about the null hypothesis?
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