At an examination at which 500 candidates appeared, boys out numbered girls by 14% of all the candidates. The number of passed candidates exceeded the number of failed candidate by 300. Boys failing in the examination numbered 80. Calculate the coefficient of collignation between boys and success in the examination and find Yule's coefficient from it.
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- According to a recent report, 12% of all adults eat pizza with a knife and fork. A researcher believes this claimed value is incorrect. When she conducts her own survey of a random sample of adults, she finds that 8% of the adults in her sample report eating pizza with a knife and fork. Dividing 8 by 100 will give the researcher theThe management of a supermarket wants to find if there is a relationship between the number of times a specific product is promoted on the intercom system in the store(x) and the number of units of that product sold (y). To experiment, the management selected a product and promoted it on the intercom system for 7 days, recording the number of times this product was promoted each day and the number of units sold. Summaries of a study conducted gave the following results: ∑x=177, ∑y= 144, SSxx=809.4286, SSyy=261.7143, SSxy= 407.8571 a) Calculate the correlation coefficient (r) relating number of times this product was promoted each day and the number of units sold. b) Find the regression line.A researcher collects data that represents the average number of hours of sleep in the last two nights by 8 depressed patients and 9 non-depressed patients. The researcher is interested in whether the two groups reliably differ in the amount of sleep they get. Use Jamovi to calculate t-obt and the p value.
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