The number of television sets coming off a production line each day is known to have a standard deviation of 120 sets per day.  The production manager tells you that the 95% confidence interval for the population mean was 442.7to 747.3 . How large of a sample was this confidence interval based on?

Q: Find the value of t a/2 for a 99% confidence interval when the sample size is 30

A: Given Confidence = 99% n=30

Q: Calculate the confidence intervals for 100 mg/L cholesterol at 90% and 95% confidence levels.…

A: Given Information: x=100 mg/L Confidence levels = 90% and 95% and the z-values for various…

Q: If we want a 95% confidence interval for proportion within 3% how large a sample do we need?

A: It is given that margin of error (E) is 0.03 and the confidence level is 0.95.

Q: Strictly speaking, what is the best interpretation of a 95% confidence interval for the mean? If…

A: In general, the 95% confidence interval interprets that there is 95% confidence that the population…

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

A:

Q: We wish to know the 95% confidence interval for the population proportion of people who believe that…

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: In a sample of 100,40 said they preferred Pepsi to Coke. A 95% confidence interval for the…

A:

Q: If a 90% confidence interval for the mean is (75.3 to 80.9), we would reject H0 : = 70 in favor of…

A:

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: Given a sample size of 400 with a mean of 80 and the population standard deviation is found to be 35…

A: We have given that,  Sample mean (x̄) = 80, population standard deviation (σ) = 35 and sample size…

Q: In a survey, the planning value for the population proportion is p* = 0.25. How large sample should…

A: Given information Error = 0.09 Population proportion = 0.25 Confidence level = 0.95

Q: A student was asked to find a 90% confidence interval for the proportion of students who take notes…

A: The provided information are:

Q: Kim wants to determine a 80 % confidence interval for the true proportion ? of high school students…

A:

Q: In a sample of 100, 40 said they preferred Pepsi to coke. A 95% confidence interval for the…

A:

Q: A 95% confidence interval for a population mean was reported to be 152 to 160. If o = 16, what…

A: Given that the confidence interval for a population is 152 to 160. σ=16

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

A:

Q: Suppose you survey a random sample from a large population to understand the population proportion.…

A: Given information- Margin of error, E = 6% = 0.06 Confidence level, c = 98% Since nothing is known…

Q: . A researcher collects a sample of 24 measurements from a population and wishes to find a​ 99%…

A: The degrees of freedom is,

Q: Find the sample size needed for a confidence interval about the population proportion if you want a…

A:

Q: Suppose we want a 90% confidence interval for the average amount spent on books by freshmen in their…

A: Given that  For 90%  confidence interval  The margin of error =2  Standard deviation=$30 We have to…

Q: . A survey of folk music fans yields this 95% confidence interval estimate of the proportion of fans…

A: The 95% confidence interval for proportion of fans who love music of David Wilcox is 0.74 to 0.86

Q: Based on sample data, the 95% confidence interval for the population mean is about $150 to $250. If…

A: The null and alternative hypothesis is, Ho: µ = $260 versus H1: µ ≠ $260 The 95% confidence interval…

Q: For a confidence interval of 5.4 +/- 0.2 find the % confidence level if the standard deviation is…

A:

Q: Suppose you calculate a 95% confidence interval for a proportion to to be: 0.39 to 0.78. Determine…

A: Given,   Lower bound = 0.39​ Upper bound = 0.78   Here, we use to determine the margin of error.

Q: If we want a 96% confidence interval on population mean with a sample size of 23, find zα2 or tα2

A: It is given that the confidence level is 96%.

Q: A random sample of 100 packs of apples with a professed weight of 1kg was found to have mear 1020g…

A: Consider X as the random variable that indicates the weight of an apple. The provided information is…

Q: In a random sample of 80 teenagers, the average number of texts handled in a day is 50. The 96%…

A: Given information: n = 80 μ=50 96% confidence interval for the mean number of texts handled by teens…

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: Is 12 minutes the margin of error for this 95% confidence interval v [Select ]

A: The 95% confidence interval for the average arrival time before departure for all air travellers is…

Q: what is the 90% confidence interval of the standard deviation where n= 20 and s=40.5

A:

Q: A quality control expert at a pretzel factory took a random sample of 10 bags from a production run…

A:

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: 3. In a sample of 300 people, 154 said that they watched news on television. Find the 90% confidence…

A: Given : Sample size of people (n) = 300 Let X : No. of people from sample  who said they watched…

Q: A group of 101 patients with end stage renal disease were given the drug Epoetin. The mean…

A: Givensample size(n)=101Mean(x)=10.3standard deviation(s)=9.9confidence interval = 99%

Q: In a sample of 23, the mean is  x¯x¯ = 91.74 with a standard deviation of s = 9.87. Assuming the…

A:

Q: If you want to make a confidence interval for the mean with the TI-84, which of the following…

A: For the given statement Select the correct choice ?

Q: Nearly one half of americans aged 25 to 29 are unmarried.  How large a sample is necessary to…

A: The formula for the sample size is as follows:

Q: A health professional takes the temperatures of 5 patients:   99.8    98.3    96.9    98.0    98.3…

A: We have given that  A health professional takes the temperatures of 5 patients: 99.8    98.3    96.9…

Q: If n = 23, ¯x = 35, and s = 3, construct a confidence interval at a 95% confidence level. Assume the…

A:

Q: Suppose a 95% confidence interval for the mean is (10, 12) when you know the value of the population…

A: Introduction: In order to construct the conventional confidence intervals for mean, an underlying…

Q: If [1740, 1850] is a confidence interval for a population mean. Find the margin of error. Select…

A:

Q: A random sample of 500 observations yields x̅ =400 and s=50. What is the  95% confidence interval…

A:

Q: You are told that a 95% confidence interval for the population mean is 17.3 to 24.5. If the…

A: we have to identify true or false.

Q: For a sample with a mean of 10, a std of 5 and an n of 30, what is the lower bound of the 95%…

A: Given data, x=10σ=5n=30z-value at 95% confidence is Zc=1.96

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

A:

Q: Thirty randomly selected students took the calculus final. If the sample mean was 95 and the…

A: The summary of statistics is, The degree of freedom is, Critical value: By using the t-tables, the…

Q: Suppose you needed to form a 92% confidence interval for a population mean. What z value would you…

A:

Q: The average salary of 81 random employees in a certain financial sector was 3400 USD. From past…

A: Population standard deviation=450 Sample size =81

Q: Bob makes a 95% confidence interval with a random sample of 100 and his margin of error is plus or…

A: Here we need to choose from the correct option.

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.