The average salary of 81 random employees in a certain financial sector was 3400 USD. From past information, we can assume that the standard deviation of the population is 450 USD. We are interested in the 90% confidence interval for the population mean. What is the value of the standard error? Select one: O a. 50 O b. 40 O c. 60 O d. 30

Q: Self-Reported Health Status Excellent 30 Very Good 80 Good 100 Fair 60 Рor 30 TOTAL 300

A: The true proportion of Americans, that falls in the health category status of "poor" is defined…

Q: Which of the following would increase the width of a confidence interval for a population mean?

A:

Q: Among various ethnic groups, the standard deviation of heights is known to be approximately three…

A:

Q: A 95% confidence interval for the mean hours freshmen spent on social media per day was calculated…

A: Solution: From the given information, the 95% confidence interval for the mean hours freshmen spent…

Q: #7. On the verbal section of the SAT, the standard deviation is known to be 100. What size sample…

A: Introduction: The 100 (1 – α) % confidence interval for the population mean, μ, when the population…

Q: A sample of 200 corporate managers produced the mean job-related stress score of 7.9 with a standard…

A: It is given that,

Q: We are studying a new variety of cherry tomato plants. In each scenario below, our agricultural…

A: Hey, since there are multiple subparts posted, we will answer first three subparts. If you want any…

Q: The General Social Survey asked: “How many e-mails do you send in a day?” The results of 928…

A: Given information Sample size n = 928 Mean x̅ = 10.4 Standard deviation s = 28.5 Since significance…

Q: Among various ethnic groups, the standard deviation of heights is known to be approximately three…

A:

Q: Which of the following would result in a larger width for a confidence interval? A- use a larger…

A: Smaller sample size or large variability will have large width for a confidence interval.

Q: 1. A group of 10 surgery patients had a mean weight of 240 pounds with a sample standard deviation…

A: We have given that  Sample size n =10 Sample mean =240 Sample standard deviation =25 95% confidence…

Q: A college admissions officer takes a simple random sample of 110 entering freshmen and computes…

A: Given,sample size(n)=110sample mean(x¯)=465population standard…

Q: The average daily volume of a computer stock in 2011 was μ=35.1million​ shares, according to a…

A:

Q: A sample of 64 was taken from a population, with the mean of the sample being 25 and the standard…

A: It is given that  Sample mean = 25 Sample standard deviation = 2 Sample size = 64 Confidence level =…

Q: A researcher calculates a 90% confidence interval of (0.24,0.4) for a proportion. What was the…

A: Given :confidence level = 90% confidence interval = (0.24,0.4) p is unknown, so p=0.5 We want to…

Q: A sports shop records the sales of items made in China and those made in America. Country of…

A:

Q: Given a mean of 483, a standard deviation of 29, and a sample size of 60, construct a 95 %…

A: A mean of 483, a standard deviation of 29, and a sample size of 60, construct a 95% confidence…

Q: At a certain Senior High School, a random sample of 10 male students was taken and found that their…

A: Here, mean is 63.36 and standard deviation is 4.62. We will use one sample t confidence interval.

Q: A bank officer wants to determine the amount of the average total monthly deposits per customer at…

A: Given,   Margin of error = 200 Standard deviation = 1000   Critical value: Using z-table, the…

Q: An agriculture publication daims that the population mean of the birth weights for all Alpine goats…

A:

Q: The daily intakes of milk (in ounces) for ten randomly selected people were: 23.3 28.4 10.5 16.4…

A: Confidence interval: The (1-α) % confidence interval for population standard deviation is given by:

Q: 7. If n=25 and the sample standard deviation is 15, construct a 95% confidence interval for the true…

A: We have given that, n = 25 , Standard deviation = 15, We need to construct the 95% confidence…

Q: A random sample of 17 hotels in Boston had an average nightly room rate of $165.40 with a sample…

A: Followings are the Explanation of the question  Use the t distribution to calculate t critical value…

Q: An investigative reporter contacts a random sample of hotels, and finds a 95% confidence interval…

A: Given that  The 95% confidence interval for the proportion of hotels in the united states have…

Q: In a sample of 30 people, the average cost of a latte is $3.82. The standard deviation for the…

A: Given : n = 30 x¯ = 3.82 s = 1.66 Confidence level = 99%

Q: What is the 95% confidence interval for the mean number of hours spent by senior high school…

A:

Q: A sample of 49 managers reveals a sample mean of $45,420. The standard deviation of the sample is…

A:

Q: According to Dietary Goals for the US (1977), high sodium intake may be related to ulcers, stomach…

A: We have given that  Sample size n =9 Sample mean =214 Standard deviation =7.5

Q: An electrical firm manufactures light bulbs for LCD projectors. A randomly selected sample of 24…

A: We have given that,  Sample mean (x̄) = 600 hours, standard deviation (s) = 50 hours , sample size…

Q: A 99% confidence interval for a population mean was reported to be 140 to 150. If population…

A: It is given that the 99% confidence interval for a population mean is 140 to 150. The population…

Q: A sample of 150 brand A light bulbs showed a mean lifetime of 1392 hours and a standard deviation of…

A: Option C is correct

Q: Market research indicates that a new product has the potential to make the company an additional…

A: It is given that,Sample mean = $3.8 million.Sample standard deviation, s is $1.8 million.The sample…

Q: 530 males in the sample who gave a numeric response from 0 to 6, the mean was 2.51 and the standard…

A: Provided information is, n =530 x̅ =2.51 s =0.87 90% confidence interval can be calculated as:…

Q: Based on a previous study, it is known that the dividend payout ratio of an industry resembles a…

A: Given: An investment manager collects data from 81 companies in an industry. Let n represents the…

Q: A study is to be conducted to estimate the daily water consumption per person. If the population…

A:

Q: For a population, the value of the standard deviation is 2.51. A random sample of 35 observations…

A:

Q: If a class took an exam and scored a mean of 82 with a standard deviation of 12, what would be the…

A: Given, Mean(x)=82Standard Deviation(s)=12

Q: If a sample of size n = 25 is chosen from a normal population, which one of the following is a 95%…

A:

Q: To assess the accuracy of a laboratory scale, a standard weight known to weigh 1 gram is repeatedly…

A: The confidence level is 95%; standard deviation is σ=0.01; and E=±0.0001

Q: The dollar value of orders placed through a particular store catalog is found to be normally…

A: Given data,σ=21.58n=30x=81.25z-value at 90% CI is Zc=1.645

Q: A random sample of 17 hotels in Boston had an average nightly room rate of $165.40 with a sample…

A: It is given that  Sample mean = $165.40 Sample standard deviation = $21.70 Sample size = 17

Q: According to Dietary Goals for the US (1977), high sodium intake may be related to ulcers, stomach…

A: We have given that, Mean(x̄) = 238, standard deviation (s) = 8.3, sample size (n) = 9 and confidence…

Q: A brand batteries will be tested to see if their average life span is more than 60 hours. For this…

A:

Q: The average daily volume of a computer stock in 2011 was μ=35.1million​ shares, according to a…

A:

Q: A sample of 64 is taken from a population, with the mean of the sample being 119 and the standard…

A: Option B is correct (113, 125)

Q: 1) In an effort to estimate the mean amount spent per customer at Oliver's Eatery in Astoria,…

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: Ten years after graduation, the salaries of Heriot-Watt University graduates are Normally…

A: Interpretation for confidence intervals:   It is 90% or 95% or 99% confident that the population…

Q: Among various ethnic groups, the standard deviation of heights is known to be approximately three…

A:

Q: on the data she gathers. Which one of the following combinations of sample size and confidence level…

A: here AS PER GUIDELINES I HAVE CALCULATED FIRST MAIN QUESTION , AS YOU HAVE POSTED MULTIPLE DIFFRENT…