You are a student in a health psychology class. You are interested in the average income of an adult in the U.S. You go out and get a random sample of 30 working adults and you ask them their income. You were able to obtain the following income from 30 working adults: Adult ID 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Annual Income $102,757.16 $113,785.95 $99,867.21 $94,223.55 $71,937.66 $87,974.10 $98,194.31 $92,170.37 $76,638.32 $91,326.73 $98,973.30 $70,547.81 $78,084.72 $78,690.09 $64,754.76 Adult ID 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Annual Income $88,264.44 $76,430.66 $98,270.22 $93,595.77 $95,102.70 $105,085.11 $71,094.34 $98,201.52 $74,130.75 $86,445.22 $71,513.74 $87,155.25 $77,643.07 $75,751.45 $90,712.64 41. Calculate the standard deviation for the sample using the formula below: Please show me your work. Show your steps. DO NOT ROUND UNTIL THE END,

The General Social Survey is an annual survey given to a random selection of about 1500 adults in the United States. Among the many questions asked are "What is the highest level of education you've completed?" and "If you're employed full-time, how many hours do you spend working at your job during a typical week?" We're interested in examining whether or not there are differences in the typical work week length based on the level of education of the worker. We perform a one-way, independent-samples ANOVA test, with the "groups" in the ANOVA being categories of highest educational degree of the worker ("less than high school," "bachelor's degree," etc.) and the variable being the number of hours written down by the worker in answering the survey question.           (a)Suppose that the results of our ANOVA are given in the ANOVA table below. Complete the missing cell of the ANOVA table (rounding your answer to two decimal places).   Source of variation Degrees of freedom Sum of…

I need help with something regarding this problem.  The National Sleep Foundation recommends that adults aged 18 to 64 get an average of 8 hours of sleep per night. A survey of sleep hours was taken during a Statistics class. The data is listed below:   4, 5, 5, 5, 5.5, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 10, 10   Do we have enough evidence at the 0.05 significance level to say that statistics students tend to get less sleep than the recommended average of 8 hours per night?   How would I get the degrees of freedom?

Question: In a class of 50 students, the scores on a statistics exam are as follows: 10 students scored 80, 15 students scored 70, 20 students scored 60, and the rest scored 50. What is the mean score on the exam?