# Statistics Homework Answers & Questions

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Statistics Help 1.      In a normal distribution, 75% of the items are under 100 and 20% are over 200. Find the mean and standard deviation of the distribution. 2.      Use the tabulated values of the standard normal variable (z table) in order to figure out values of z1 and z2 as shown in the follo...

One can calculate the 95% confidence interval for the mean with the population standard deviation known. This will give us an upper and a lower confidence limit. What happens if we decide to calculate the 99% confidence interval? Describe how the increase in the confidence level has changed the widt...

• Answered A GUIDE TO HOW TO WRITE EFFECTIVE RESEARCH PROJECT/ THESIS/...

Content of the Thesis/Research project/ Dissertation Preliminaries Chapter One:                 Introduction of the Study Chapter Two:                 Literature Review Chapter Three:              Research Methodology Chapter Four:                Analysis and Discussion Chapter Five:               ...

When one thinks of the normal distribution, the first thing that comes to mind is the bell curve and grades. While this is one example of a normal curve that is widely recognized, it is not the only one. Try to come up with a unique normal distribution that your classmates have not posted already. E...

• Answered The mean human gestation period is 266 days. Actu

The mean human gestation period is 266 days. Actual time to delivery is approximately normally distributed with a standard deviation of about 12 days. Marcelle goes into labor and gives birth to a child 245 days after conception. What percentage of women give birth (a) at the same point in pregnancy...

• Answered QMB Harvard Final Exam Final Assessment Test I (Complete Ans...

1.The median is often a better representative of the central value of a data set when the data set:SourceTop of Form·       Is bimodal.·       Has a high standard deviation.·       Is highly skewed.·       Has no outliers.2.The data in the Excel spreadsheet linked below provide information on the nu...

Option 1: Springdale Shopping Survey Instructions The major shopping areas in the community of Springdale include Springdale Mall, West Mall, and the downtown area on Main Street. A telephone survey has been conducted to identify strengths and weaknesses of these areas and to find out how they fit i...

Instructions The major shopping areas in the community of Springdale include Springdale Mall, West Mall, and the downtown area on Main Street. A telephone survey has been conducted to identify strengths and weaknesses of these areas and to find out how they fit into the shopping activities of local...

Option 1: Springdale Shopping Survey Instructions The major shopping areas in the community of Springdale include Springdale Mall, West Mall, and the downtown area on Main Street. A telephone survey has been conducted to identify strengths and weaknesses of these areas and to find out how they fit i...

• Answered In the 1960s, data were collected on the weights

In the 1960s, data were collected on the weights of people to determine the safe passenger capacity of aircraft. Using a random sample the mean weight was found to be 166.3 lbs. In recent decades, the mean weight of the population has increased considerably, so we need to update our estimate of that...

• Answered A golf ball manufacturer desires to compare the d

A golf ball manufacturer desires to compare the distance traveled by golf balls using four unique designs. Fifteen balls were manufactured and each was brought to the local golf course for testing by the local pro. The order of the golf balls hit by the professional was randomized so the pro did not...

• Answered The percentage of people in a population with a c

The percentage of people in a population with a certain ailment (Ailment A) is 15%. A. If you select a sample of 10 people from this population, what is the probability at least half of them have Ailment A? B. What is the probability at most 3 of them would have this ailment? C. If you select a sa...

• Waiting for answer The cost of 14 models of digitals cameras at a ca

The cost of 14 models of digitals cameras at a camera specialty store during 2014 was as follows: 340 450 450 280 220 340 290 370 400 310 340 430 270 380 1. Compute mean, median, mode, first and third quartile. 2. Compute the variance, standard deviation, range, interquartile range, coefficient of...

• Answered Confidence interval for proportion

A survey showed that 80% of the 1600 adult respondents believe in global warming. Construct a 95% confidence interval estimate of the proportion of adults believing in global warming.

• Answered The following data represent glucose blood levels

The following data represent glucose blood levels(mg/100 ml) after a 12 hour fast for a random sample of 70 women. Use six classes and determine the class width. (Enter the number only. Do not include any other text.) 45, 66, 83, 71, 76, 64, 59, 59 76, 82, 80, 81, 85, 77, 82, 90 87, 72, 79, 69, 83,...

• Waiting for answer An extended warranty is a prolonged warranty offe

An extended warranty is a prolonged warranty offered to consumers by the warranty administrator, the retailer, or the manufacturer. A recent report in The New York Times (November 23, 2009) suggests that 20.4% of laptops fail over three years. Roberto D'Angelo is interested in an extended warranty f...

• Answered State STAT 200 Multiple Choice Question

1.The data summary used to calculate the p-value in order to decide between the null hypothesis and the alternative hypothesis is called aA) test statistic.B) statistically significant result.C) significance level.D) p-value. 2. Determine if the statement is a typical null hypothesis (Ho) or alterna...

A cancer specialist from the Los Angeles County General Hospital (LACGH) rated patient optimism in 20- to 40-year-old male patients with incurable cancer in 1970. In 1990, the researcher examined hospital records to gather the following data: Socioeconomic status (1–7 rating of occupation; higher r...