A mechanic sells a brand of automobile tire that has a life expectancy that is normally distributed, with a mean life of 25,000 miles and a standard devialloh of 2100 miles. He wants to give a guarantee for free replacement of tires that don't wear well. How should he word his guarantee if he is willing to replace approximately 10% of the tires? Click to view page 1 of the table Click to view page 2 of the table Tires that wear out by miles will be replaced free of charge. (Round to the nearest mile as needed.)

Shelia’s doctor is concerned that she may suffer from gestational diabetes (high blood glucose levels during pregnancy). There is variation both in the actual glucose level and in the blood test that measures the level. A patient is classified as having gestational diabetes if her glucose level is above 136 milligrams per deciliter (mg/dl) one hour after ingesting a sugary drink. Shelia’s measured glucose level one hour after the sugary drink varies according to the Normal distribution with μ = 125 mg/dl and σ = 11 mg/dl. a)What are the mean and standard deviation of the distribution of sample proportion if measurements are made instead on 40 separate days? b)If measurements are made on 40 separate days and the mean result is compared with the criterion 140 mg/dl, what is the probability that Shelia is diagnosed as having gestational diabetes? c)Let’s consider what could happen if we took 40 separate measurements from Shelia. What is the blood glucose level L such that the probability…

Please help with this problem. Can you please explain using a calculator. Thank you.

The data show the test results from students in two classrooms, one integrated and one not. There are two sets of test scores, a pre-test and a post-test for both groups. First, calculate a measure of change in the test scores for students in both groups. Then, use the resulting measure of change to compare both groups on the measure of change from the pre-test to the post-test. When finished, write a short summary of what you found, including: Group 1 mean Group 2 mean Ho and H1 t-observed t-critical

ANSWER THE LAST 2 QUESTIONS PLEASE

A population of N = 8 scores has a mean of M = 10.  After one score is removed, the mean is found to be M = 5  What is the value of the score that was added? A   X = 45 B   X = 35 C   X = 50 D   X = 80

A researcher gives a depression scale to 300 people now, 6 weeks later, and 6 months later. She finds that the depression scale means are relatively the same over those three time periods. Does this mean that the depression scale is valid, and/or reliable? Explain.

In a data set with 25 scores, if the value 16 occurs 12 times, what is its relative frequency?

Please answer part a-d. please show all your work