The weights (in pounds) of eight vehicles and the variability of their braking distances (in feet) when stopping on a wet surface are shown in the table below. a) At the 5 % level of significance can...

The weights (in pounds) of eight vehicles and the variability of their braking distances (in feet) when stopping on a wet surface are shown in the table below.
a) At the 5 % level of significance can you conclude that there is a significant linear correlation between vehicle weight and variability in braking distance on a wet surface?
b) Is weight a useful predictor of braking distance ?

Question 2


A medical researcher claims that a new drug affects the number of headache hours experienced by headache sufferers. The number of headache hours (per day) experienced by eight randomly selected patients before and after taking the drug are shown in the table. At the 5 % level of significance can you support the researcher’s claim? Assuming symmetric differences

Attempt all questions Question 1 The weights (in pounds) of eight vehicles and the variability of their braking distances (in feet) when stopping on a wet surface are shown in the table below. a) At the 5 % level of significance can you conclude that there is a significant linear correlation between vehicle weight and variability in braking distance on a wet surface? b) Is weight a useful predictor of braking distance ? Question 2 A medical researcher claims that a new drug affects the number of headache hours experienced by headache sufferers. The number of headache hours (per day) experienced by eight randomly selected patients before and after taking the drug are shown in the table. At the 5 % level of significance can you support the researcher’s claim? Assuming symmetric differences Question 3 Is there a difference in average weekend movie attendance? Eight small-town movie theaters were surveyed to see how many movie patrons were in attendance on Saturday evening and on Sunday evening. Is there sufficient evidence to reject the claim that there is no difference in movie attendance for Saturday and Sunday evenings? Using α= 0.10 . Assuming same shape population. Question 4 A researcher wishes to determine whether there is a relationship between the gender of an individual and the amount of alcohol consumed. A sample of 68 people is selected, and the following data are obtained. At α= 0.10, can the researcher conclude that alcohol consumption is related to gender? Question 5 An ABC News poll asked adults whether they felt genetically modified food was safe to eat. Thirty-five percent felt it was safe, 52% felt it was not safe, and 13% had no opinion.A random sample of 120 adults was asked the same question at a local county fair. Forty people felt that genetically modified food was safe, 60 felt that it was not safe, and 20 had no opinion. At the 0.01 level of significance, is there sufficient evidence to conclude that the distribution of people surveyed differ from those reported in the survey? Question 6 The number of grams of fiber per serving for a random sample of three different kinds of foods is listed. Is there sufficient evidence at the 0.05 level of significance to conclude that there is a difference in mean fiber content among breakfast cereals, fruits, and vegetables? 1 | Page