A recent poll found that 21% of a random sample of 1200 people lost jobs due...
A recent poll found that 21% of a random sample of 1200 people lost jobs due to coronavirus in Canada.
a) calculate the standard error
b) using the z-table estimate z* (the critical value for z) for a 95% confidence interval.
c) calculate the margin of error (ME) for a 95% confidence interval
d) what is the interval for a 95% confidence interval (C.I.)
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A recent poll found that 21% of a random sample of 1200 people
lost jobs due...
11.1.31 Question Help A poll found that people from the north now have relatively warm feelings toward people from the south. A poll, conducted by telephone among a random sample of 949 adults, found...
11.1.31 Question Help A poll found that people from the north now have relatively warm feelings toward people from the south. A poll, conducted by telephone among a random sample of 949 adults, found that 797 of those sampled consider the two regions friends. The margin of error for the poll was plus or minus 2.3 percentage points (for a 0.95 confidence level Use this information to obtain a 95% confidence interval for the percentage of all northerners wno consider...
1. A random sample of size n is drawn from a population that is normally distributed...
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2. We refer to a recent poll on Democratic candidates for the Presidential election 2020, among...
2. We refer to a recent poll on Democratic candidates for the
Presidential election 2020, among a random national sample of 1,003
adults. Results have an error margin of plus or minus 3.5
percentage points. In the poll, Joe Biden, Elizabeth Warren, and
Bernie Sanders were answered to be an appropriate candidate by 27%,
21%, and 19%, respectively. Assume the level of significance, α =
5%.
(a) Calculate the standard deviation of the sample. (25 pts)
(b) Evaluate the result...
11.1.31 Question Help A poll found that people from the north now have relatively warm feelings toward people from the south. A poll, conducted by telephone among a random sample of 949 adults, found that 797 of those sampled consider the two regions friends. The margin of error for the poll was plus or minus 2.3 percentage points (for a 0.95 confidence level Use this information to obtain a 95% confidence interval for the percentage of all northerners wno consider...
1. A random sample of size n is drawn from a population that is normally distributed with a standard deviation of 8. The sample mean is found to be 50. 1.a) Construct a 98% confidence interval (CI) for the population mean uif the sample size is 16. The critical value used is The (margin of) error for the 98% confidence interval (C.I.) is The resulting Cl is 1.b) Construct a 95% confidence interval for the population mean u if the...
In a poll, 51% of the people polled answered yes to the question "Are you in favor of the death penalty for a person convicted of murder?" The margin of error in the poll was 3%, and the estimate was made with 96% confidence. At least how many people were surveyed? Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). The minimum number of surveyed people was...
A recent poll found that "433 of the 1548 randomly-selected adults questioned felt that unemployment compensation should be extended an additional six months while the country is in its current economic downturn." We want to use this information to construct a 95% confidence interval to estimate the proportion of the U.S. adults who feel this way. (5 pts) Il. State the parameter our confidence interval will estimate and the point estimate. a. The first two conditions to construct a confidence...
In a recent poll, 350 people were asked if they liked skiing, and 55% said they did. Find the margin of error of this poll, at the 90% confidence level. As in the reading, in your calculations: --Use z1.645 for a 90% confidence interval -Use z=2 for a 95% confidence interval -Use z-2.576 for a 99% confidence interval Give your answer rounded to three decimal places. If n=560 and p (p-hat) = 0.7, construct a 99% confidence interval. As in...
2. We refer to a recent poll on Democratic candidates for the
Presidential election 2020, among a random national sample of 1,003
adults. Results have an error margin of plus or minus 3.5
percentage points. In the poll, Joe Biden, Elizabeth Warren, and
Bernie Sanders were answered to be an appropriate candidate by 27%,
21%, and 19%, respectively. Assume the level of significance, α =
5%.
(a) Calculate the standard deviation of the sample. (25 pts)
(b) Evaluate the result...
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