17 20 22 19 19 17 18 18 26 25 18 19 25 18 2888 20 18 18 26 188 19 18 18 18 ∞ ∞ 7. Mean = 8. Median = 9. Mode = 2

six hundred adult americans were asked by telephone poll, "what do you think constitutes a middle-class income?" Include left endpoint, but not right endpoint. salary:                                                                         R. Freq. < 20000                                                                      0.02 20000-25000                                                              0.09 25000-30000                                                              0.19 30000-40000                                                              0.26 40000-50000                                                              0.18 50000-75000                                                              0.17 75000-99999                                                              0.02 100000+                                                                     0.01 A. what percentage if the survey answered not sure B. What percentage think that middle-class is from $25,000 to…

find the mean of the number of spots that appear when a die is tossed

x1:   Rate of hay fever per 1000 population for people under 25 96, 92, 122,126, 94, 123,12, 93, 125, 95, 125, 117, 97, 122,127, 88 x2: Rate of hay fever per 1000 population for people over 5097, 112,103, 96,114, 88, 110, 79, 15, 100, 89, 114, 85, 96 x1 = s1 = x2 = s2 =  Compute the corresponding z or t-value as appropriate. (Test the difference ?1 − ?2. Do not use rounded values. Round your answer to three decimal places.) What is the value of the sample test statistic? Find a 90% confidence interval for ?1 − ?2. (Round your answers to two decimal places.)lower limit:________upper limit:________

An experiment was conducted to study the effect of temperature and type of oven on the life of the component being tested. The numbers recorded in the table below represent the number of days the component lasted before it broke. Use this table to answer all the parts that follow. Oven Oven Temperature (\deg F) 01 020304 500(F) 227 214225260221259236229treatment mean? 203.167 227 224550(F)187181232246208 179198273600(F)174198178 206202219194 213How many treatments are there? What is the first

If data consist of age of 500 patients and the researcher want to present age as class intervals, * number of classes equal 5 O 6 O 12 O 10 O 8 O

Modified True or False VIFs exceeding 10 are sign of low autocorrelation.

For every set of data the value of the trimmed mean will always be one of the original items of data. * true false

Every year, the students at a school are given a musical aptitude test that rates them from 0 (no musical aptitude) to 5 (high musical aptitude). This year's results were: Aptitude Score Frequency 0 2 1 3 2 2 3 2 4 3 5 4 The mean (¯xx¯) aptitude score:  (Please show your answer to 1 decimal place.)The median aptitude score: The mode aptitude score:  (Please separate your answers by ',' in bimodal situation. Enter DNE if there is no mode.) Hint: Textbook Measures of Center

Suppose that the mean score of a class of 29 students was 78. The 16 male students in the class had mean score of 66. What was the mean score for the 13 female students? Mean Score for Female Students = previ