We calculate a confidence interval. Then we gather additional data and find a new confidence interval. What happens to the margin of error if the sample size increased but the standard deviation and confidence stay the same? Explain your reasoning. If the sample size is increase

Q: (b) Estimate the sample size needed if no estimate of p is available. A sample of adults is needed…

A: here given that MOE = 0.05 , Confidence Level =  80% , .So area in both tail = 0.20 /2  = 0.10 Here…

Q: Which of the following correctly describes how the width of a confidence interval for a population…

A: The interval narrows if the sample size increases and confidence level stays the same. Explanation:…

Q: answer this question A random sample of 59 observations was taken. The average in the sample was 80…

A:

Q: You sample 36 families to find out how much they spent on groceries last month. Your sample mean is…

A: Given data,n=36x=540s=82α=0.05

Q: Based on the description above, label the hypothesis below με 98.6° Fahrenheit O null hypothesis O…

A:

Q: 61 students are asked in a survey how many hours they work during a week. Their responses have a…

A: The random variable X follows normal distribution. The sample size is 61. The sample mean is 24. The…

Q: Believe it or not, there are some people who dont think that Duke will win the NCAA tournament this…

A: Obtain the 90% Confidence Interval for the IQ of DDs.   The 90% Confidence Interval for the IQ of…

Q: A random sample of 121 students from Clayton State was selected to estimate the average ACT score of…

A:

Q: It is often difficult (if not impossible) to determine the population mean. We use confidence…

A: The population mean is often difficult or impossible to determine directly.Confidence intervals are…

Q: Data Analysis, please show all work The amount of yearly rainfaill in Chicago was sampled. 40 years…

A: Confidence interval is the range used to determine where the population mean lies. It varies based…

Q: The next five questions refer to the following scenario: 10 sample mean x • sample sizen = 100…

A:

Q: In a survey, 17 people were asked how much they spent on their child's last birthday gift. The…

A: Given that,The sample size  is 17.The sample mean  is $47.The sample standard deviation  is $3. The…

Q: Continuing the last question: An accountant wants to know the mean time to prepare a tax return.…

A: Given,sample size(n)=20sample mean(x¯)=2.67standard deviation(s)=0.95degrees of…

Q: 13. This summer, when I was doing gardening, I got some seeds. The packet with seeds said that 95%…

A:

Q: Hi Expert, I need help. Thanks A graduate student is interested in how viewing different kinds of…

A: The null and alternative hypotheses as: H0 : μD = 0 Ha : μD ≠ 0   Mean difference (MDD) -0.9…

Q: Calculate the mean and standard deviation for the two sets of data. Calculate the 95% confidence…

A: Mean and standard deviation for dataset A: Mean x¯=∑i=1nXin=70.24+70.22+70.103=210.563=70.1867…

Q: Believe it or not there are some people who don't think that duke will win the NCAA tournament this…

A: It is given that the sample size is n=28. The sample mean is x¯=90. The sample standard deviation is…

Q: Parts a and b please

A:

Q: You sample 36 students to find out how many hours they spent online last week. Your sample mean is…

A: Given data is appropriate for testing of hypothesis for single mean. Because it is a large sample…

Q: A second student did the same survey for a different class of 29 students, but was not able to find…

A: Sample mean = x̅ = 2.9 Sample size = n = 29 Sample S.D = s = 1.8 Standard Error = s/√n  =…

Q: In a survey, 18 people were asked how much they spent on their child's last birthday gift. The…

A: The summary of statistics is, x¯=30,s=16,n=18 The degree of freedom is, df=n-1   =18-1   =17…

Q: Use the confidence interval to find the margin of error and the sample mean. (0.072,0.210) The…

A: Given Confidence of interval (0.072,0.210)

Q: You do a study of hypnotherapy to determine how effective it is in increasing the number of hours of…

A: The 95% confidence interval for the mean number of hours slept is obtained below as follows: The…

Q: Convert the estimate and your confidence interval to Percents. Discuss reasons the estimate might be…

A: We have to convert the estimate and confidence interval into the percentage.

Q: Briefly discuss the meaning of a 95% confidence interval and a 99% confidence interval and how they…

A: A confidence interval is a range of values that quantifies the uncertainty or level of confidence…

Q: Suppose you constructed a 90% confidence interval for the true average GPA of California community…

A: Solution: 1. From the given information, 90% and 80% confidence interval for the true average GPA of…

Q: Fandango is experiencing record high sales and rentals for films over the course of the pandemic.…

A: In statistical inference, there are two types of estimation,  1) Point estimation and 2) Interval…

Q: A study was conducted to measure the effectiveness of hypnotism in reducing pain. The measurements…

A: Calculation:

Q: An article appeared in an Australian newspaper. It described a study of academic performance and…

A: Given that: Sample mean, x¯=3 Sample standard deviation, s=1.1 Sample size, n=50 Level of…

Q: What does a 95% confidence interval actually mean?

A: We have to interprete the 95% confidence interval for the actual mean.

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A: To identify: If you were going to make gender comparisons like this, which option would be the…

Q: Marketing companies have collected data implying that teenage girls use more ringtones on their…

A: Given n1=n2=20 S1=1.5 S2=0.8

Q: Explain how In mean or proportion. Choose the correct answer below. ation vanance is mere om linding…

A: Here, Given that confidence interval for variance and confidence interval for mean or proportion.

Q: The M&M’s in your bag are a sample which will represent the population of all M&M’s. Record…

A: (a) Assumptions of confidence interval for the proportion of M&M’s that are blue: The samples…

Q: Get an education: In 2012 the General Social Survey asked 844 adults how many years of education…

A: From the provided information, Sample size (n) = 844 Sample mean (x̄) = 8.54 Standard deviation (s)…

Q: d. The 95% confidence interval for the parameter of interest is (.D. (Round to two decimal places as…

A: The sample size is n = 100 And sample proportion is 0.50 At 95% confidence level, the critical value…

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.