Answer Happy

One study of grand juries in Alameda County, California, compared the demographic characteristics of jurors with the general population, to see if the jury panels were representative. The results for age are shown below. The investigators wanted to know whether these 66 jurors were selected at random from the population of Alameda County. (Only persons 21 and over are considered; the county age distribution is known from Public Health Department data.) Fill out the last column below. All of your answers hould be accurate to the tenth digit, for example 4.8. County-wide percentage number of jurors expected number of jurors Age 21 to 40 42 5 41 to 50 23 9 51 to 60 16 19 61 and over 19 33 total 100 66 The value of x2 is Your answer should be an integer with no decimals. The degrees of freedom is Check that the p-value is essentially zero from the table. (True or False) With simple random sampling, it is almost impossible for a jury to differ this much from the county age distribution. The inference is that grand juries are not selected at random. Write true or false.