What are the predictor variables in general and what we can observe in general—normal distribution, skewed in any plot or graph

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 deviation of 2400 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 here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. Tires that wear out by (Round to the nearest mile as needed.) miles will be replaced free of charge.

Nonparametric test is a design to counter the non-normal distribution type of data. True O False

find  a) probability b) maximum limit

Why does the mean accurately summarize a normal distribution? why does the mean inaccurately summarize a skedded distribution?

The normal curve (also called a bell-shaped curve, or bell curve) is a visual representation of a distribution of scores that has three characteristics. What are those characteristics?

Sleep apnea is a disorder in which you have one or more pauses in breathing or shallow breaths while you sleep. In a​ cross-sectional study of 310 adults who suffer from sleep​ apnea, it was found that 155 had gum disease.​ Note: In the general​ population, about​ 17.5% of individuals have gum disease. Complete parts​ (a) through​ (c) below. Click here to view the standard normal distribution table (page 1). LOADING... Click here to view the standard normal distribution table (page 2). LOADING... Click here to view the table of critical t-values. LOADING... ​(a) What does it mean for this study to be​ cross-sectional?     A. The data were obtained at a specific point in time and the study was an experiment.   B. The data were obtained over the course of time and the study was an observational study.   C. The data were obtained over the course of time and the study was an experiment.   D. The data were obtained at a specific point in time and the study was an…

Identify if its true or false The mean, median and mode of normal distribution are NOT necessarily equal.

Sunscreens are products that protect the skin from skin cancer by preventing the sun's ultraviolet (UV) radiation from penetrating the skin. According to dermatologists, the recommended amount of sunscreen needed to cover the exposed areas of the body is at least an ounce. In a study conducted specifically for a group of women aged 21 to 30 years, it was found the amount of sunscreen (X) applied by the group follows the normal distribution with mean of 0.6 ounce and standard deviation of 0.25 ounce. About ___% of the women aged 21 to 30 years is applying 0.1 to 1.1 ounce of

Question: How to describe normal distribution and skewed in the histogram and density plots in general. Also, explain any correlation we observe between the response and predictor variables in any scatter plots in general.