As part of a study into healthy lifestyles, Jing visited Surrey Hills University. Jing recorded a person's position in the university and how frequently they ate a salad. Results are shown in the table. Jing conducted a \( \chi^{2} \) test for independence at a \( 5 \% \) level of significance. 2. State the null hypothesis. [1] 3. Calculate the \( p \) - value for this test. [2]

What is a scatter plot?

15. Suppose data collected for heights (in cms) of 390 cows were tabulated in a frequency distribution and the following results were obtained. fi: \( 6,25,48,72,116,60,38,22,3 \) CMI \( =112, \mathrm{CM} 2=117 \) where CMi ith class mark Determine: a) Class interval size (class width), Class limits, Class boundaries and class marks b) The less than cumulative frequency distribution c) The class intervals having the highest frequency d) Above which height do we find \( 50 \% \) of the cows? c) Below which height do we get \( 25 \% \) of the cows? Draw a) histogram b) a frequency polygon c) C. a less than ogive for the above data

What is a scatter plot?

The mean weight of 150 students in a certain class is 60 Kg . The mean weight of boys in the class is 70 Kg and that of the girls is 55 Kg 。 Find the number of boys and the number of girls in the class.

What is a scatter plot?