This topic contains a solution. Click here to go to the answer

Author Question: Lube-Tech is a major chain whose primary business is performing lube and oil changes for passenger ... (Read 1119 times)

lilldybug07

  • Hero Member
  • *****
  • Posts: 546
Lube-Tech is a major chain whose primary business is performing lube and oil changes for passenger vehicles.
 
  The national operations manager has stated in an industry newsletter that the mean number of miles between oil changes for all passenger cars exceeds 4,200 miles. To test this, an industry group has selected a random sample of 100 vehicles that have come into a lube shop and determined the number of miles since the last oil change and lube. The sample mean was 4,278 and the standard deviation was known to be 780 miles. Based on a significance level of 0.10, the critical value for the test is approximately z = 1.28. Indicate whether the statement is true or false

Question 2

A normally distributed population has a mean of 500 and a standard deviation of 60. Determine the probability that a random sample of size 25 selected from the population will have a sample mean greater than or equal to 515.
 
  A) 0.1056
  B) 0.1761
  C) 0.0712
  D) 0.0151



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

elizabethrperez

  • Sr. Member
  • ****
  • Posts: 344
Answer to Question 1

TRUE

Answer to Question 2

A




lilldybug07

  • Member
  • Posts: 546
Reply 2 on: Jun 24, 2018
Wow, this really help


bassamabas

  • Member
  • Posts: 294
Reply 3 on: Yesterday
Gracias!

 

Did you know?

The horizontal fraction bar was introduced by the Arabs.

Did you know?

More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

Did you know?

Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.

Did you know?

Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.

Did you know?

There are immediate benefits of chiropractic adjustments that are visible via magnetic resonance imaging (MRI). It shows that spinal manipulation therapy is effective in decreasing pain and increasing the gaps between the vertebrae, reducing pressure that leads to pain.

For a complete list of videos, visit our video library