Probability that the psychic correctly identifies the symbol

Assignment Help Basic Statistics
Reference no: EM137748

1. A manufacturer receives parts from two suppliers. An SRS of 400 parts from supplier 1 finds 20 defective. An SRS of 100 parts from supplier 2 finds 10 defective. Let p1 and p2 be the proportion of all parts from suppliers 1 and 2, respectively, that are defective. The standard error needed to compute a 95% confidence interval for p1 - p2, the difference in the two proportions is

A. 0.001.
B. 0.063.
C. 0.032.

2. A noted psychic was tested for ESP. The psychic was presented with 400 cards face down and asked to determine if each card was marked with one of four symbols: a star, cross, circle, or square. The psychic was correct in 120 cases. Let p represent the probability that the psychic correctly identifies the symbol on the card in a random trial. Suppose you wish to see if there is evidence that the psychic was doing better than just guessing. To do this you test the hypotheses

H 0: p = 0.25,
H a: p > 0.25.

The P-value of your test is

A. 0.0104.
B. 0.0146.
C. 0.9896.

2. A manufacturer receives parts from two suppliers. An SRS of 400 parts from supplier 1 finds 20 defective. An SRS of 100 parts from supplier 2 finds 10 defective. Let p1 and p2 be the proportion of all parts from suppliers 1 and 2, respectively, that are defective. A 98% confidence interval for p1 - p2, the difference in the two proportions is

A. -0.05 ± 0.033.
B. -0.05 ± 0.068.
C. -0.05 ± 0.074.

Reference no: EM137748

Questions Cloud

What is the estimate of the overall proportion : We want to know if his support has decreased. In computing a test of hypothesis with , what is the estimate of the overall proportion?
Performs a test of hypothesis : Drug sniffing dogs must be 95% accurate. A new dog is being tested and is right in 46 of 50 trials. Find a 95% confidence interval for the proportion of times the dog will be correct.
Determine - test the hypotheses : A bank wants to get new customers for their credit card. They try two different approaches in their marketing campaign. The first promises a "cash back" reward; the second promises low interest rates. A sample of 500 people are mailed the first br..
Margin of error with confidence : An SRS of 100 of a certain popular model car in 1993 found that 20 had a certain minor defect in the brakes. An SRS of 400 of this model car in 1994 found that 50 had the minor defect in the brakes. Let p1 and p2 be the proportion of all cars of t..
Probability that the psychic correctly identifies the symbol : A noted psychic was tested for ESP. The psychic was presented with 400 cards face down and asked to determine if each card was marked with one of four symbols: a star, cross, circle, or square. The psychic was correct in 120 cases. Let p represent..
Determine the confidence interval : Which of the following assumptions for inference about a proportion using a confidence interval are violated,
Standard error for the proportion : Let p represent the proportion of registered voters in the state that would vote for the Republican candidate. The standard error for the proportion of those who phoned in who answered "yes" is
The p-value of a test : To determine if this is evidence that students perform worse under uncomfortable conditions, The P-value of a test
Simple random samples from the appropriate populations : Based on surveys conducted in 1989 and 1999, a researcher compared the proportion of high school age females interested in a career in science in 1989 with the proportion in 1999. He concluded that the proportions were not significantly different ..

Reviews

Write a Review

 

Basic Statistics Questions & Answers

  Legitimate probability distribution for this situation

What is the probability you pick a plum and Which of the following is a legitimate probability distribution for this situation

  Simple random samples from the appropriate populations

Based on surveys conducted in 1989 and 1999, a researcher compared the proportion of high school age females interested in a career in science in 1989 with the proportion in 1999. He concluded that the proportions were not significantly different ..

  Determine the confidence interval

Which of the following assumptions for inference about a proportion using a confidence interval are violated,

  Describe the sampling distribution of the sample proportion

Describe the sampling distribution of the sample proportion

  Conduct a marketing experiment

Conduct a marketing experiment in which students are to taste one of two different brands of soft drink

  Determine the value of k

MATH1550H: Assignment:  Question:     Experience shows that X, the number of customers entering a post office during any period of time t, is a random variable the probability mass function of which is of the form

  Find the standard deviation and sampling distribution

How large should n be so that the standard deviation of is no more than 0.01 and sampling distribution

  What is the least number

MATH1550H: Assignment:  Question:     what is the least number of applicants that should be interviewed so as to have at least 50% chance of finding one such secretary?

  Performance in the high jump

Below is a plot of the Olympic gold medal winning performance in the high jump (in inches) for the years 1900 to 1996.

  What was the mean ranking for the females in this class

The chance both flights are full is 0.6. Are the two flights being full independent events and What was the mean ranking for the females in this class

  Example on sampling distribution

A study sponsored by American Express Co. and the French government tourist office found that old American stereotypes about French unfriendliness weren't true.

  Determine the monthly payment

Investigate the cost of a home mortgage and to determine the monthly payment.

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!

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