The data below are the final exam scores of 10 randomly selected calculus students and the number of hours they slept the night before the exam. Hours(x)
4
6
3
9
3
5
5
6
7
4
Scores(y)
64
79
59
87
65
77
84
89
89
70

1. Make a scatter plot for these data and determine the direction of the relationship between sleep hours and Scores.
2. Find the correlation coefficient (r) between Hours and Scores.
3. Determine whether there is a significant linear correlation between the two variables.
4. If there is a positive/negative linear correlation,
5. Find the equation of the regression line. and what is the best-predicted score of a student who slept 8 hours?

Select the correct answer. which is a benefit of planning for your future career? a.being less prepared after high school. b.having higher tuition in college. c.earning college credits in high school. d.ruining your chances of having a successful career.

Sales at a fast-food restaurant average $6,000 per day. the restaurant decided to introduce an advertising campaign to increase daily sales. to determine the effectiveness of the advertising campaign, a sample of 49 days of sales were taken. they found that the average daily sales were $6,300 per day. from past history, the restaurant knew that its population standard deviation is about $1,000. if the level of significance is 0.01, have sales increased as a result of the advertising campaign? multiple choicea)fail to reject the null hypothesis.b)reject the null hypothesis and conclude the mean is higher than $6,000 per day.c)reject the null hypothesis and conclude the mean is lower than $6,000 per day.d)reject the null hypothesis and conclude that the mean is equal to $6,000 per day.expert answer

Lin corporation has a single product whose selling price is $136 per unit and whose variable expense is $68 per unit. the company’s monthly fixed expense is $32,400. required: 1. calculate the unit sales needed to attain a target profit of $5,000. (do not round intermediate calculations.) 2. calculate the dollar sales needed to attain a target profit of $8,400.