State the null and alternative hypotheses

Assignment Help Basic Statistics

Reference no: EM13275003

The average salary of senior managers in the construction industry is $180,000 per year. Suppose we would like to take a sample of senior managers at a newly established company XYZ to see whether the mean annual salary is different from that of the industry.

a) State the null and alternative hypotheses.

b) suppose a sample of 40 senior managers at XYZ showed a sample mean annual salary of $170,000. Assume a population standard deviation of $30,000 with a = 0.05 as the value of significance, what is your conclusion?

Need to know whether this is a one tailed or two tailed step and how do you know that?

Need step by step breakdown so I can follow and study for exam please.

The time needed to drive from city A to city B is normally distributed with a mean of 180 minutes and standard deviation of 20 minutes.

a) what is the probability that a person will drive from city a to city b in three hours or more?

b) what is the probability that a person will drive from city a to city b in more than 140 minutes?

c) what is the probability that a person will drive from city a to city b in exactly three hours?

d) what is the probability that a person will drive from city a to city b in less than 2.5 hours?

Please answer with step by step directions and state formula being used.

In an effort to estimate the mean annual amount spent per customer for groceries at a particular supermarket data were collected for a sample of 100 households. The sample showed an average amount of $8,000. If the population standard deviation is $500,

a) develop an 80% confidence interval estimate of the population mean annual amount spent

b) develop an 85% confidence interval estimate of the population mean annual amount spent

c) if the data were collected for a sample of 50 households rather than 100, develop an 85% confidence interval estimate of the population mean annual amount spent, assuming the population has a normal probability distribution.

what does is mean a normal probability distribution and how is it different from part a) and b).

Reference no: EM13275003

Questions Cloud

Assume the chemical formula of the compound : Predict the chemical formula of the compound that results from the reaction between the elements Si and O.

What is the conversion ratio : Moniker Manufacturing's bonds were recently issued at their $1,000 par value. At any time prior to maturity (20 years from now), a bond holder can exchange a bond for a share of common stock at a conversion price of $44. What is the conversion rat..

What is the most likely total of long-term debt plus equity : If the firm follows a maturity matching (or moderate) working capital financing policy, what is the most likely total of long-term debt plus equity capital?

How many total transitions are there for hydrogen : Are there transitions of higher or lower energy that are not seen? How many total transitions are there for hydrogen

State the null and alternative hypotheses : The average salary of senior managers in the construction industry is $180,000 per year. Suppose we would like to take a sample of senior managers at a newly established company XYZ to see whether the mean annual salary is different from that..

Discuss the main functions of human resourse management : Discuss the main functions of Human Resourse Management and what is the most important issue facing HR Managers, employees, and Organizations today.

Find the distance of compression : A 2.50-kg block slides on a horizontal surface with coefficient of kinetic friction 0.310. It is moving at 5.45 m/s, Find the distance of compression

Globalization has pros and cons but pros : Globalization has pros and cons but pros are more if the principles of globalization are going to be implemented properly. No system is perfect and thus pros and cons will be there, but if pros are more than cons, then that system will produce more b..

Explain the reasoning behind your conclusion : Information systems are typically thought of as being the responsibility, and even property, of the department that manages an organization's information technology, often called IT.

User Account

All Pages