Question

Can someone show me how to work these problems out, step by step.

6. A doctor is interested in determining whether a film about excercise will change about exercise. The results of his questionnaire are shown. A higher numerical vi value shows a Before Ater 12 vorable attitude toward exercise. Is there enough evidence to support the c claim. use (?? 0.05 13 12 14 A sample of 150 people from a certain industrial community showed that 80 people suffered from a lung disease. ? sample of 100 people from a rural com munity showed that 30 suffered from the same lung disease. Ata 0.05, is there a difference between the proportion of people who suffer from the disease in the two communities? 7. A random sample of 51 observations was selected from a normally mean was z 98. to conclude that the population variance is not equal to 64 at the 0.05 level of signifieance. distributed population. The sample 37.5, does this sample show sufficient reason s. 2, and the sample variance was s2 A ski shop manager claims that the average of the sales for her shop is $1800 a day during the winter montis. Ten winter days are selected at random, and the mean of the sales is $1830, The standard deviation of the population is S200, Can you reject the claim at ? u ons? Also, find the 95% confidence interval of the mean. 9. During June, a local theater recorded the following number of patrons per day. 102 116 113 132 128 117 156 182 183 171 168 179 170 160 163 187 185 158163 167 168 186 117 108171 173 161 163 168 182 Construct a frequency distribution for the data. Use six classes. Find the mean and standard deviation. Graph the histogram, and frequency polygon for the data. 1o.

Answer 1