A highway department is studying the relationship between traffic flow and speed. The following model has been hypothesized:
y = β0 + β1x + ε
where
The following data were collected during rush hour for six highways leading out of the city.
Traffic Flow (y) |
Vehicle Speed (x) |
---|---|
1,257 | 35 |
1,327 | 40 |
1,226 | 30 |
1,333 | 45 |
1,350 | 50 |
1,122 | 25 |
In working further with this problem, statisticians suggested the use of the following curvilinear estimated regression equation.
ŷ = b0 + b1x + b2x2
(a)
Develop an estimated regression equation for the data of the form
ŷ = b0 + b1x + b2x2.
(Round b0 to the nearest integer and b1 to two decimal places and b2 to three decimal places.)ŷ =
(b)
Use α = 0.01 to test for a significant relationship.
State the null and alternative hypotheses.
H0: b0 =
b1 = b2 = 0
Ha: One or more of the parameters is not equal
to zero.H0: b1 =
b2 = 0
Ha: One or more of the parameters is not equal
to zero. H0: One or more
of the parameters is not equal to zero.
Ha: b0 =
b1 = b2 =
0H0: One or more of the parameters is not equal
to zero.
Ha: b1 =
b2 = 0
Find the value of the test statistic. (Round your answer to two decimal places.)
Find the p-value. (Round your answer to three decimal places.)
p-value =
What is your conclusion?
Reject H0. We conclude that the relationship is significant.Reject H0. We cannot conclude that the relationship is significant. Do not reject H0. We cannot conclude that the relationship is significant.Do not reject H0. We conclude that the relationship is significant.
(c)
Base on the model predict the traffic flow in vehicles per hour at a speed of 38 miles per hour. (Round your answer to two decimal places.)
vehicles per hour
using excel data analysis tool for regression,steps are:
write data>menu>data>data
analysis>regression>enter required labels>ok> and
following o/p is obtained
SUMMARY OUTPUT | ||||||||
Regression Statistics | ||||||||
Multiple R | 0.990248 | |||||||
R Square | 0.980591 | |||||||
Adjusted R Square | 0.967651 | |||||||
Standard Error | 15.60166 | |||||||
Observations | 6 | |||||||
ANOVA | ||||||||
df | SS | MS | F | Significance F | ||||
Regression | 2 | 36892.6 | 18446.3 | 75.78224 | 0.002704 | |||
Residual | 3 | 730.2357 | 243.4119 | |||||
Total | 5 | 37622.83 | ||||||
Coefficients | Standard Error | t Stat | P-value | Lower 95% | Upper 95% | Lower 95.0% | Upper 95.0% | |
Intercept | 431.5714 | 139.1712 | 3.10101 | 0.053254 | -11.3336 | 874.4764 | -11.3336 | 874.4764 |
(x) | 37.40929 | 7.696494 | 4.860562 | 0.01663 | 12.91561 | 61.90297 | 12.91561 | 61.90297 |
X² | -0.38214 | 0.102137 | -3.74148 | 0.033311 | -0.70719 | -0.0571 | -0.70719 | -0.0571 |
a)
ŷ = 432 + 37.41x -0.382x2.
b)
H0: b1 =
b2 = 0
Ha: One or more of the parameters is not equal
to zero.
test stat=75.78
p value=0.003
p value >α=0.01, do not reject Ho
Do not reject H0. We cannot conclude that the relationship is significant
c)
ŷ = 432 + 37.41x -0.382x2.
x=38
ŷ = 432 + 37.41*38
-0.382*382=
1301.31(answer)
.
A highway department is studying the relationship between traffic flow and speed. The following model has...
A statistical program is recommended. A highway department is studying the relationship between traffic flow and speed. The following model has been hypothesized: у %3DВо + В,х +е where y traffic flow in vehicles per hour x = vehicle speed in miles per hour The following data were collected during rush hour for six highways leading out of the city Traffic Flow Vehicle Speed (x) (y) 1,257 35 40 1,327 1,226 30 1,333 45 50 1,350 1,122 25 In working...
A highway department is studying the relationship between traffic flow and speed. The following model has been hypothesized where ytraffic flow in vehicles per hour x vehicle speed in miles per hour The following data were collected during rush hour for six highways leading out of the city Traffic Flow (y) 1306 1398 1240 1154 1445 1227 Vehicle Speed (T) 35 50 35 25 50 30 a. Develop an estimated regression equation for the data The regression equation is: 1...
A highway department is studying the relationship between traffic flow and speed. The following model has been hypothesized where y traffic flow in vehicles per hour x vehicle speed in miles per hour The following data were collected during rush hour for six highways leading out of the city Traffic Flow (y) 1,256 1,330 1,226 1,335 1,350 1,125 Vehicle Speed (x) 35 35 50 25 Enter negative values as negative, if necessary a. Show the estimated regression equation (to 3...
c. Estimate the traffic flow in vehicles per hour at a speed of 39 miles per hour (to 2 decimals). The estimated value is = ____ (to 2 decimals) 99% Confidence interval = ( , ) (to 2 decimals) 99% Prediction interval = ( , ) (to 2 decimals) A highway department is studying the relationship between traffic flow and speed. The following model has been hypothesized. ŷ = bo + b12+b222 where y=traffic flow in vehicles per hour I...
A statistical program is recommended. Consider the following data for two variables, x and y. x 22 24 26 30 35 40 y 13 20 33 35 40 36 (a) Develop an estimated regression equation for the data of the form ŷ = b0 + b1x. (Round b0 to one decimal place and b1 to three decimal places.) ŷ = (b) Use the results from part (a) to test for a significant relationship between x and y. Use α =...
You may need to use the appropriate technology to answer this question. In a regression analysis involving 27 observations, the following estimated regression equation was developed. ŷ = 25.2 + 5.5x1 For this estimated regression equation SST = 1,550 and SSE = 550. (a) At α = 0.05, test whether x1 is significant. State the null and alternative hypotheses. H0: β1 = 0 Ha: β1 ≠ 0H0: β0 = 0 Ha: β0 ≠ 0 H0: β1 ≠ 0 Ha: β1...
The National Highway Traffic Safety Administration reported the percentage of traffic accidents occurring each day of the week. Assume that a sample of 420 accidents provided the following data Sunday Monday Tues day Wednesday Thursday riday Saturday 50 53 47 69 (a) Conduct a hypothesis test to determine if the proportion of traffic accidents is the same for each day of the week. Use a 0.05 level of significance. State the null and alternative hypotheses. Ho: Not all proportions are...
CENGAGE | MINDTAP Q Search this course Julia Chapter 16 Assignment A highway department is studying the relationship between traffic flow and speed. The following model has been hypothesized. y = Bo+ B 1x + B 2x2 + € where y = traffic flow in vehicles per hour x = vehicle speed in miles per hour The following data were collected during rush hour for six highways leading out of the city. Traffic Flow (y) Vehicle Speed (x) 1,257 1,329...
QUESTION THREE On an urban highway, the relationship between vehicle speed and density can be represented by the Greenburg Model as the data in Table 3.1. Due to the roadwork on this highway, the width of both traffic lanes is narrowed and a bottleneck to traffic flow forms. The maximum flow on the unobstructed highway is 5000 vehicles per hour whilst on the section under repair the maximum flow is 4000 vehicles per hour. When the traffic flow approaching the...
A statistical program is recommended. Data showing the values of several pitching statistics for a random sample of 20 pitchers from the American League of Major League Baseball is provided. Player Team W L ERA SO/IP HR/IP R/IP Verlander, J DET 24 5 2.40 1.00 0.10 0.29 Beckett, J BOS 13 7 2.89 0.91 0.11 0.34 Wilson, C TEX 16 7 2.94 0.92 0.07 0.40 Sabathia, C NYY 19 8 3.00 0.97 0.07 0.37 Haren, D LAA 16 10 3.17...