+1-415-315-9853

info@mywordsolution.com

## Statistics

problem1.)  Exit polling has been a controversial practice in recent elections, since early release of the resulting information appears to affect whether or not those who have not yet voted will do so.  Suppose that 83% of all registered NC voters favour banning the release of information from exit polls in presidential elections until after the polls in NC close.  A random sample of 75 NC voters is to be selected.

a.)  What is the probability which no more than 65 voters favour the ban?
b.)  What is the probability which at least 56 voters favour the ban?
c.)  What is the mean value of number of voters who favour the ban?
d.)  What is standard deviation of number of voters who favour the ban?
e.)  What is probability which is exactly 52 voters favour the ban?

problem2.)  On the basis of past knowledge an insurance salesperson knows that the number of long-term health care insurance policies sold per week by the company is a random variable x with the following probability distribution.

X        p(x)
0        0.245
1        0.143
2        0.125
3        0.096
4        0.078
5        0.064
6        0.039
7        0.029
8        0.181

Assume that a week is randomly selected. Find
a.)  p(x=3)    b.) p(x 4)    c.) p(x     d.) p(1

problem3.)  The scores on Algebra test have a mean of 73 and the standard deviation of 7.  If 85% of the students must have a passing score, what is that score?

problem4.)   The average diameter of sand dollars on a certain island is 4.25 centimetres with a standard deviation of 0.70 centimetres. If 16 sand dollars are selected at random for a collection, find the probability that the average diameter of those sand dollars is more than 4.13 centimetres. (Hint:  Use the Central Limit Theorem)

problem5.)  At a large department store, the average number of years of employment for a cashier is 4.2 with a standard deviation of 2.1 years, and the distribution is approximately normal. If an employee is picked at random, what is the probability that employee has worked at the store for over 5 years?

problem6.)  A sample of 500 racing cars showed that 75 of them cost over \$700,000. What is the 95% confidence interval for the true proportion of racing cars that cost over \$700,000?  Give an interpretation for this confidence interval.

problem7.)   In a study of 10 insurance sales reps from a certain large city, the average age of the group was 46.6 and the standard deviation was 3.8 years.  Find the 95% confidence interval of the population mean age of all insurance sales reps in that city.  Give an interpretation for this confidence interval.

problem8.)
A medical researcher wishes to determine the percentage of females who take vitamins.  He wishes to be 99% confident that the estimate is within 2 percentage points of the true proportion.  A recent study of 250 females showed that 45% took vitamins.  How large should the sample size be?

problem9.)
A state executive claims that the average number of acres in western PA state park is less than 2000 acres.  A random sample of five parks is selected, and the number of acres is given below.  With α = 0.01, is there enough evidence to support the claim?
959    1187    493    6249    541

problem10.)
A telephone company representative estimates that 45% of its customers have call waiting service.  To test this hypothesis, she selected a sample of 100 customers and found that 37% had call waiting.  With α = 0.01, is there enough evidence to reject the claim?

Statistics and Probability, Statistics

• Category:- Statistics and Probability
• Reference No.:- M9930

Have any Question?

## Related Questions in Statistics and Probability

### Two population meansa tomato farmer with a very large farm

Two Population Means A tomato farmer with a very large farm of approximately 2200 acres had heard about a new type of rather expensive fertilizer which would supposedly significantly increase his production. The frugal f ...

### Onenbspstudy based on responses 1014nbsprandomly

One study, based on responses 1,014 randomly selected teenagers, concluded that 39% of teenagers cite grades as their greatest source of pressure. Use a 0.05 significance level to test the claim that fewer than half of a ...

### A drug company wants to analyze if its new marketing

A drug company wants to analyze if its new marketing strategy adopted last year is successful is increasing sales. It randomly chooses 49 drugs from its list of products. For each drug, it computes the sales (in million ...

### Problem 1somewhere in the milky way galaxy a class of 2000

Problem 1 Somewhere in the Milky Way Galaxy, a class of 2,000 students took a course in Astronomy.  The first exam scores and the final exam percentage reached earth, but transmission broke off after only a dozen student ...

### In a pulse rate research a simple random sample of 120 men

In a pulse rate research, a simple random sample of 120 men results in a mean of 80 beats per minute, and a standard deviation of 11 beats per minute. Based on the sample results, the researcher concludes that the pulse ...

### A cotton grower in south georgia produces cotton on farms

A cotton grower in South Georgia produces cotton on farms in Statesboro and Brooklet, ships it to cotton gins in Claxton and Millen where it is processed, and then sends it to distribution centers in Savannah, Perry, and ...

### The department of education would like to determine if

The Department of Education would like to determine if there are gender differences in the performance of twins on the state mandated mathematics examination. As a result, they have collected data on twelve sets of twins ...

### 1 how do quasi-experimental designs differ from true

1. How do quasi-experimental designs differ from true experiments? 2. Under what circumstances would a researcher use a quasi-experimental rather than an experimental design?

### Recall that very satisfied customers give the xyz-box video

Recall that "very satisfied" customers give the XYZ-Box video game system a rating that is at least 42. Suppose that the manufacturer of the XYZ-Box wishes to use the 65 satisfaction ratings to provide evidence supportin ...

### Of the people who fished at clearwater park today 63 had a

Of the people who fished at Clearwater Park today, 63 had a fishing license, and 27 did not. Of the people who fished at Mountain View Park today, 60 had a license, and 40 did not. (No one fished at both parks.) Suppose ...

• 13,132 Experts

## Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

### Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

### Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

### Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

### Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

### Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen