User Account

All Pages

The average salary of senior managers in the construction

Assignment Help Basic Statistics
Reference no: EM13272925

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).

step by step breakdown and formula used please.

Reference no: EM13272925

Questions Cloud

What would be the cost to retailer : On the problems you just completed for me, how did you come up with the cost price to the retailer of $7.11? I understand the profit margin is 40% so wouldn't that mean that 9.95*.60=5.97 would be the cost to retailer?
Determine the cost recovery for 2014 : Kendra Brown, a sole proprietor, acquires a new five-year asset on April 17, 2014, for $480,000. This is the only asset acquire by Kendra during the year. Kendra does NOT elect §179 and elects out of bonus depreciation. On September 1, 2014..
Determine flint hills park''s net income for 2014. : Flint Hills Park is a private camping ground near the Lathom Peak Recreation Area. It has compiled the following financial information as of December 31, 2014.
The researchers utilized linear regression : 1.Find a peer-reviewed article that provides an example of a study where the researchers utilized linear regression. Briefly describe the study and discuss its findings in your own words.
The average salary of senior managers in the construction : 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 ..
Why is a repeated measures anova statistically : If a researcher decides to use multiple comparisons in a study with three conditions, what is the probability of a Type I error across these comparisons? Use the Bonferroni adjustment to determine the suggested alpha level.
What is the slope, y-intercept : Q. An owner of a chain of stores would like to predict weekly sales based on the number of customers who made a purchase. A random sample of 10 stores were selected. The weekly sales are in thousands of dollars.
What is happening physiologically : Your client is a 15 year old male with was playing football several days ago and is now admitted with epididymitis and a hydrocele. What signs and symptoms would you expect to find? What is happening physiologically? What factors may impact the color..
What circumstances-multiprotocol router : What is the significance of a layer 3 switch when compared to a layer 2 switch? How does a router differ from a layer 3 switch? Under what circumstances would you want to use a router? Under what circumstances would you want to use a multiprotocol ro..

Reviews

Write a Review

Basic Statistics Questions & Answers

  Describing probability density function

Let X be a random variable uniformly distributed on the interval (0,1). Let Y be a new random variable defined as Y = X2. What is the probability density function of Y given by?

  Distribution and coefficient of skewness

For a sample of engineers, the mean salary is $95,000 with a standard deviation of $30,000. The median value is $80,000. What is the relative shape of the distribution and coefficient of skewness?

  What is the sample standard deviation

Use the Standing data set to develop a point estimate of the number of minutes during an NFL game that players are standing around between plays. Round your answer to two decimal places. What is the sample standard deviation? Round your answer to ..

  The cost of health care is the subject of many

Clothing for Runners: Your company sells exercise clothing and equipment on the internet. To design the clothing, you collect a data on the physical characteristics of you different types of customers

  Compare the nicotine content of two different brand

The Oregon health & science university's news website gives information on a study that found that some commercial cigarette brands contain 10 to 20 times higher percentages of nicotine in the "free-base" form, that is, the form thought to be ..

  Exams in math and in spanish

Last week Sarah had exams in Math and in Spanish. On the math exam, the mean was m = 40 with s = 5, and Sarah had a score of X = 45. On the Spanish exam, the mean was m = 60 with s = 8 and Sarah had a score of X = 68. For which class should Sara e..

  Algebra problems-academic response

Write the following phrase using symbols. 4 times the sum of m and q. Elaine was charged $195 interest for 1 month on a $1000 credit card balance. What was the monthly interest rate

  Categorical variable-quantitative variable

Select the appropriate word to identify whether the measurement represents a categorical variable or a quantitative variable: The average number of minutes a person watches television each day.

  Find probability of reaching the destination

The hiker has no map and makes random choices of trail and subtrail. What is the probability of reaching the destination?

  Develop a forecasting model, justifying its selection

Develop a forecasting model, justifying its selection over other techniques, and project attendance through 2007.

  Hypothesis test to find whether true mean yield decreased

A random sample of 8 recent batches produced the following yields. Conduct a hypothesis test to determine whether the true mean yield has decreased.

  Poker card game-classical probability

The probability of drawing two diamonds (to complete a flush) after discarding the 5 and 7.

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

Submit Assignment

Academics

Major Subjects

Majors

Get In Touch

whatsapp: +1-415-670-9521

Phone: +1-415-670-9521

Email: [email protected]

TERMS & POLICIES

HELP & SUPPORT

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd