12. Teacher Carol, wants to conduct a survey about the average number of students in a certain school who wants online class instead of distance modular learning. If she plans to use 99% confidence level, 0.5 as the margin of error, and a standard deviation of 5. How many sample sizes does she need for the survey?

Q: If you think a data point is an outlier, what test can you perform to see if you should omit the…

A: An outlier in a data set is a value that is significantly large or small compared to the other…

Q: 6. If your boss in order to save money decreases the sample size, what will happen to the width of…

A: The width of the confidence interval is the difference of lower limit and upper limit of a…

Q: 10 A local health care facility would like to estimate the proportion of patients referred to them…

A: 10. Given information, the margin of error is 0.15. Confidence level is 99%. Significance level is…

Q: What is the point estimate of the population mean? What is the estimated standard error of the…

A: Given: Sample size, n=25Sample mean,x¯=165Sample sd, s=15

Q: What sample size is needed if a researcher needed to calculate the true proportion of individuals…

A: HERE , MOE  = 0.01 confidence level = 95% here z-critical for 95% confidence level = 1.96 here use…

Q: A credit card manager wishes to determine the proportion of customer calls that result in a…

A: From the given information, the percentage to be 10%(p=0.10) Given precision of 15% and confidence…

Q: 4) A simple random sample is to be taken of 572 business majors in a college to estimate the…

A: When we don't have any prior information about population proportion, we generally take it as 0.50.…

Q: 7. As your sample size increases, you should expect your objective risk to (increase/ decrease).

A: As the sample size increases,we can expect our objective risk to decrease. Since objective risk is…

Q: 1. Because of uncertainty in real estate markets, many homeowners are considering remodeling and…

A: given that,sample-1 : (20427 , 27255 , 22115 , 23256 , 21887 , 22786 , 19852 , 23624 , 25885 , 28999…

Q: What is the minimum required sample size to make a 97% confidence interval for a population…

A:

Q: Explain which would result in a wider large-sample confidence interval for : a 90%pconfidence level…

A: The z critical value for 95% confidence interval is 1.96 and the z-critical value for 90% confidence…

Q: 4. Define what is a Sampling Distribution of Sample Means and how it correlates to the Central Limit…

A:

Q: A college dean would like to estimate a population mean to within 40 units with 99% confidence given…

A: Given Data: Margin of error (ME)=40 Confidence level=0.99 Population standard deviation (σ)=200   a)…

Q: 9. If the population proportion is 0.6. A researcher wants the margin of error to be 0.20. and level…

A:

Q: You wish to determine what percentage of pre-kindergarten children ages 3 to 5 whose mother had a…

A: It is given that margin of error (E) is 0.05 and the confidence level is 0.90.

Q: What is the probability of getting a sample mean between 500 and 520 if the population mean is 500…

A: The population mean is 500 and the standard error of the mean is 20.The probability of getting a…

Q: What is the confidence interval estimate for the population mean? If the sample mean is 13 and error…

A: Given information: The sample mean is, M = 13 The error bound for the mean is, E = 3.2 It is…

Q: Assume that the climate conditions on Earth are such that years hotter than the historical average…

A: (1) The following hypothesis can be formed H0: p=0.5 where p is the probability that a hotter year.

Q: 8. An educational research group wishes to estimate the proportion of all California community…

A:

Q: 2. Carlos wants to replicate a study where the highest lowest observed value is 13.8 while the…

A: The random variable X follows normal distribution. We have to find the sample size. This is one…

Q: 7. Why is a confidence interval also called a "margin of error"?

A: Margin of error allows us to feel confident a certain percentage of the time within a range of…

Q: Explain which would result in a wider large-sample confidence interval for p: a sample size n=100 or…

A: The sample sizes are 100 and 400.

Q: Suppose you are planning to construct a 23% confidence interval for a one sample population…

A: We have given that confidence level (c) = 23% = 0.23

Q: . What is the difference between sampling error and sampling bias? Which one is very concerning to…

A: Sampling error is defined as the deviation in the sample values with those of the population. This…

Q: If a confidence interval for the mean is (31≤μ≤87) a) What is the point estimate?    b) What is…

A:

Q: What is the margin of error for a sample of 34 students whose average height, with 90% confidence,…

A: Confidence Interval: Confidence interval is the interval estimate of the population parameter. It is…

Q: what is the sample variance and standard deviation of 21​,16​,3​,9​,11

A: The formula for sample variance and standard deviation is given by:

Q: Consider a study conducted in 2018, where researchers wanted to estimate the percentage of middle…

A: Given Information: Margin of error =3% Confidence interval is 95% Consider z value for significance…

Q: if the margin of error for the population mean for 99% confidence level is 39, what is the standard…

A:

Q: Provide a scenario for which you would use an independent sample t test. Also, explain in your own…

A: Introduction :-  Here we have to explain  Condition where independent sample t test can be applied…

Q: Explain the effect on the margin of error and hence the effect on the accuracy of estimating a…

A: Effect on margin of error: If the sample size increases, then the standard error of statistic…

Q: Find the minimum sample size required to construct a 95% confidence interval estimate for the…

A: From the provided information, Margin of error (E) = 3.5% or 0.035 Confidence level = 95%

Q: 7.35 Fill in the blank. When doing an ANOVA, you observe large differences in means between groups.…

A: ANOVA: It is a statistical method for testing hypotheses regarding the mean difference among two or…

Q: which statement is correct ( asnswer  in few  lines)  1 there is no sampling risk , if sampling…

A: Sampling risk is the risk that the conclusion reached using the sample is different from the…

Q: An HR administrator wishes to know the proportion of employees that are currently using a very…

A: It is given that margin of error (E) is 0.14 and the confidence level is 0.80.

Q: What is the standard confidence limit to determine if a sample should be included in a population?

A: Confidence limit is defined as the values at the upper and lower end of a confidence interval.

Q: The Labor Bureau wants to estimate, at a 90% confidence level, the proportion of all households that…

A: Computing the sample size: The confidence level is 90%. Therefore, α = 0.10 and α/2=0.05. The margin…

Q: 9. What sample size is needed to give a margin of error of 2.5% with a 95% confidence level?

A:

Q: A sample size must be determined for estimating a population mean given that the confidence level is…

A: Solution: From the given information, the E=0.24, largest value is 18 and the smallest value is 6.…

Q: A transportation planner wishes to estimate the proportion of commuters who drive to work within…

A: There is no specific information about the value of p. Hence, we can consider p as 0.5. A…

Q: To be tested, why does a hypothesis must specify a single number about which the hypothesized…

A: There are two types of hypotheses: one is the null hypothesis and the other is the alternative…

Q: Provide a problem statement that involves calculation for the length of confidence interval and…

A: We need to provide a problem statement that involves calculation for the length of confidence…

Q: What is the approximate sample size required to estimate the percentage of Americans who have earned…

A: We want to find the sample size (n)

Q: A school administrator wishes to conduct a poll to estimate the percentage of full-time college…

A: The formula for the sample size is as follows: Here, zα/2 is the critical value at 94% confidence…

Q: If you want to construct a 90% confident interval for a population mean such that it is within a…

A: The confidence interval for the mean is given by :    CI = x¯ ± zα2 ×σn x¯ : sample mean σ :…

Q: Suppose you construct a 90% confidence interval for the true population mean GPA of students at Taft…

A: Given that  We constructed 90% confidence interval for true population mean GPA of students at Taft…

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.