Confidence Interval for difference between proportions

To determine the possible effect of a chemical treatment on the rate of seed germination, 300 chemically treated seeds and 250 untreated seeds were sown. It was found that 267 of the chemically treated seeds and 205 of the untreated seeds germinated. Let P1 be the proportion of the population of all chemically treated seeds that germinate, and let P2 be the proportion of the population of all untreated seeds that germinate. Find a 90% confidence interval for P1-P2. Then complete the table below.

Answer to the 3rd Decimal

1. What is the lower limit of the 90% confidence interval?

2. What is the upper level of the 90% confidence interval?

Solution Preview

Please see attached file

To determine the possible effect of a chemical treatment on the rate of seed germination, 300 chemically treated seeds and 250 untreated seeds were sown. It was found that 267 of the chemically treated seeds and 205 of the untreated seeds germinated. Let P1 be the proportion of the population of all chemically treated seeds that germinate, and let P2 be the proportion of the population of all untreated seeds that germinate. Find a 90% confidence interval for P1-P2. Then complete the table below.

Answer to the 3rd Decimal

Data
Confidence level= 90%
Significance level=100%-Confidence ...

Solution Summary

Calculates the Confidence Interval for difference between proportions.

A. In a random sample of 500 people aged 20-24, 22% were smokers. In a random sample of 450 people aged 25-29, 14% were smokers. Construct a 95% confidenceintervalfor the differencebetween the population proportions. You may assume the samples are independent.
You will be asked to identify each of the following.
1. Th

Please help with the following problem. Provide step by step calculations.
After a certain candidate announced his intention for running for the premiership of a province, many polls were conducted to assess his chanced for success. Among them were two polls of independant samples taken from two populations. The poll in the

Random samples from two age groups of brides (200 brides under 18 years and 100 brides at least twenty years old) showed that 50% of brides in the under 18 group were divorced after 15 years, while 40% of brides in the 20 or older age group were divorced after 15 years. The differencebetween the two proportions is 0.10, with a

1) Does the M&M/Mars Corporation use the same proportion of red candies in its plain and peanut varieties? A random sample of 56 plains M&Ms contained 12 red candies, and another random sample of 32 peanut M&Ms contained 8 red candies.
a) Construct a 95% confidenceintervalfor the difference in the proportions of red candies f

Volunteers were randomly selected for a blind taste test between two flavored waters, A and B, at two different locations in the mall. Of 64 volunteers at the first location, 41 preferred product A. Of 58 volunteers at the second location, 35 preferred product A. Using interval estimates, determine to 95% confidence if there is

We will be constructing confidenceintervals for the proportion of each color as well as the mean number of candies per bag.
Construct a 95% ConfidenceIntervalfor the proportion of blue M&Ms® candies.
Construct a 95% ConfidenceIntervalfor the proportion of orange M&Ms® candies.
Construct a 95% Confidence Interva

A supermarket chain wants to determine the difference the proportion of morning shoppers who are man and the proportion of evening shoppers who are men. A random sample of 400 morning shoopers showed that 48 were men. A random sample of 480 evening shoppers showed 187 were men. Constuct and explain a 95% confidenceinterval e

Inferences concerning the mean difference using two dependent samples, two independent samples, and proportions.
A.
Before 93 106 87 92 102 95 88 110
After 92 102 89 92 101 96 88 105
a. What is the point estimate for the mean reduction in the diastolic reading?
b. Find the 98% confidence inter

Please help with the following problem.
Using the data on the table below, are there any correlations between population changes for the areas listed.
The following is a list of acceptable tests:
regression line and equation; correlation
one-sample t-test
one-sample t confidenceinterval
matched-pairs t-test
two-sa

Try out some of your own ideas for analyzing
this data. Use one of the following techniques:
regression line and equation; correlation
one-sample t-test
one-sample t confidenceinterval
matched-pairs t-test
two-sample t-test
two-sample t confidenceinterval
F-test for variances
ANOVA
one-sample z test forproportions