Suppose the following table illustrates the ages for a number of participants projected to enroll into a clinical trial looking at early onset of dementia. Patient Age A 64 B 57 C 58 D 53 E 71 F 54 G 63 B) With the same assumptions listed above, calculate a 90% confidence interval for the mean age of the population for which they represent.

A psychologist hypothesizes that the children with type-A personality score higher than the children with type-B personality on a memory test. The estimated standard error turned out to be 1.2, while the mean score of type-B children was 22.2 and the mean score for type-A children was 25.6. What is the t score?

A researcher hypothesizes that different colors of cars result in different average speeds.  To test this claim, she took a random sample of 20 people who own 4 different colors of colors of cars  (n = 20, N = 80, G = 4), and she then tracks their average speed on the highway for a week of driving.  The following ANOVA table has some of her results.  Please help her answer her research questions by completing the following ANOVA table below and answering the follow-up questions.  Be sure to label your answers with the appropriate letter and show all your work! Source  Sums of Squares     df   Mean Square        F     Effect (between)             Error (within) 100.90     ------ Total 170.10     ------- ------ a) What is the Sums of Squares (SS) between (effect)? b) What are the Mean Square (MS) between (effect) and the MS within (error)? c) What are the degrees of freedom (df) between, the df within, and the df total? d) What is the overall F-statistic? e) Based on the…

c and d please

A key hospital outcome measure of clinical performance is length of stay (LOS), that is, the number of days a patient is hospitalized. For patients at one hospital with acute myocardial infarction (heart attack), the length of stay over the past four years has consistently decreased. The hospital also has data for various treatment options such as the percentage of patients who received aspirin upon arrival and cardiac medication for Left Ventricular Systolic Dysfunction (LVSD). The data are as follows:   Year Average LOS Aspirin on arrival LVSD medication 2007 4.31 days 94%   89% 2008 4.10 days 96%   94% 2009 4.35 days 98%   97% 2010 4.13 days 100%   98%   Calculate descriptive statistics for the data. Do not round intermediate calculations. Round your answers to four decimal places, when needed.   Descriptive Statistics: LOS, Aspirin, LVSD     Standard Standard       Variable Mean Error Deviation Minimum Median Maximum LOS (days)             Aspirin (%)…

Gary has discovered a new painting tool to help him in his work. If he can prove to himself that the painting tool reduces the amount of time it takes to paint a room, he has decided to invest in a tool for each of his helpers as well. From records of recent painting jobs that he completed before he got the new tool, Gary collected data for a random sample of 7 medium-sized rooms. He determined that the mean amount of time that it took him to paint each room was 3.4 hours with a standard deviation of 0.3 hours. For a random sample of 6 medium-sized rooms that he painted using the new tool, he found that it took him a mean of 3.2 hours to paint each room with a standard deviation of 0.2 hours. At the 0.05 level, can Gary conclude that his mean time for painting a medium-sized room without using the tool was greater than his mean time when using the tool? Assume that both populations are approximately normal and that the population variances are equal. Let painting times without using…