A violin student records the number of hours she spends practicing during each of four consecutive...

A violin student records the number of hours she spends practicing during each of four consecutive weeks:

6.2, 5.0, 4.3, 1.2

1) Find the point estimate in the mean of hours

2) What is the sample standard deviation

3) Suppose we want to find the 96% confidence interval for the population mean. What is the critical value we use?

4) Margin of error?

5) Constuct the 96% confidence interval of the population.

Expert Solution

orchestra answered 2 years ago

1. A psychology instructor asked each student to report the number of hours he or she...

1. A psychology instructor asked each student to report the number of hours he or she spent preparing for an exam. In addition, the instructor recorded the number of errors made on each student’s exam. The data are as follows: Hours (X) Errors (Y) 0 19 1 6 2 2 4 1 4 4 5 0 3 3 5 5 SSX =...

Could the number of hours a person spends studying be related to whether or not they...

Could the number of hours a person spends studying be related to whether or not they have a roommate? At a local summer camp, a simple random sample of 100 attendees was selected. Data was collected on each attendee on how many hours they spend studying per week and whether they have a roommate. The data was then presented in the frequency table: Hours Studied Per Week Roommate Status Total No Roommate One Roommate Three 15 15 30 Five 20...

1. The chart below records number of hours 12 students spent online during the weekend and...

1. The chart below records number of hours 12 students spent online during the weekend and the Math test scores they achieved the following Monday. Hours on‐line (x) 0 7 5 2 3 5 1 3 5 10 7 6 Test scores (y) 96 75 84 82 74 76 85 95 68 50 65 58 a) Find the value of “r”, the linear regression constant b) Find the equation of the regression line c) Using the regression line, predict, if...

-----A business owner makes 1000 items a day. Each day she spends 8 hours producing those...

-----A business owner makes 1000 items a day. Each day she spends 8 hours producing those items. If hired, elsewhere she could have earned $250 an hour. The item sells for $15 each. Production occurs seven days a week. If the explicit costs total $150,000 per month, what is her economic profit? a. ?$240,000 b. ?$60,000 c. ?$300,000 d. ?$450,000 ----------------------------------------------------------------------------------------------

A 2010 study asserts that the number of hours that the average college student studies each...

A 2010 study asserts that the number of hours that the average college student studies each week has been steadily dropping (The Boston Globe, July 4, 2010). In fact, the researchers state that, in the U.S., today’s undergraduates study an average of 14 hours per week. Suppose an administrator at a local university wants to show that the average study time of students at his university differs from the national average. He takes a random sample of 35 students at...

Data are collected on the relationship between the number of hours per week practicing a musical...

Data are collected on the relationship between the number of hours per week practicing a musical instrument and scores on a math test. The line of best fit is as follows: ŷ = 72.5 + 2.8x. What would you predict the score on a math test would be for a student who practices a musical instrument for 1.2 hours a week? Round to one decimal place.

A typical college student spends an average of 2.55 hours a day using a computer. A...

A typical college student spends an average of 2.55 hours a day using a computer. A sample of 13 students at The University of Findlay revealed the sample mean of 2.70 hours and sample standard deviation of 0.51 hours. Can we conclude that the mean number of hours per day using the computer by students at The University of Findlay is the same as the typical student’s usage? Use the five step hypothesis testing procedure and the 0.05 significance level.

A statistics instructor wants to examine the relationship between the hours a student spends studying for...

A statistics instructor wants to examine the relationship between the hours a student spends studying for the final exam (Hours) and a student's grade on the final exam (Grade). She takes a sample of five students. Student x (Hours) y (Grade) 1 8 75 2 2 47 3 3 50 4 15 88 5 25 93 a. Computer the Average and Standard Deviation for x and y USING EXCEL. b. Computer the sample covariance for x & y USING EXCEL...

An ASU student spends (in normal times) an average of 1.2 hours to get to campus...

An ASU student spends (in normal times) an average of 1.2 hours to get to campus with a standard deviation of 0.2 hours. (a) (6 pts) Find the probability the average daily commute time for a period of 36 working days is between 1:15 in 1.25 hours. (b) (6 pts) Find the probability the total commute time for the 36 days is less than 40 hours. (c) (5 pts) What assumptions are necessary for the answers in parts (a) and...

A student wonders if the number of hours a student studies for an test is related...

A student wonders if the number of hours a student studies for an test is related to the score the student gets on the test. She surveyed her classmates and made these observations. The number of hours of study (x) 6,8, 10, 12, 15 The score obtained out of 100 (y) 70, 76,68 80, 95 (a) Find the correlation r between the number of hours of study and the score obtained. (b) Find the critical values for r (c) Determine...

Question