ious example, you learned about a random sample of 60 Redeye Piranha. From that sample, a 99% confidence interval for the true mean length of all Redeye Piranha in that river was calculated to be 12.09 cm to 13.67 cm.   (a) Explain what would happen to the length of the interval if the confidence level were decreased to 95%.   (b) Explain what would happen to

Q: A recent study among 150 street hawkers in Cape Town showed that 48 of them are of the opinion that…

A: Given Data: n=150 x=48

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

A: Hi! Thank you for the question, As per the honor code, we are allowed to answer one question at a…

Q: The 95 % confidence interval for the mean lead content per litre of waste water produced by her…

A: It is given that Sample size n = 500 Sample mean M = 641 Population SD = 20 The critical value of Z…

Q: what would be the 90% confidence interval of the true proportion of young adults who have received…

A: Given that sample size is n = 190 And the sample proportion is 70% = 0.7 At 90% confidence level,…

Q: What is meant by saying that a 1-a confidence interval is a. exact?b. approximately correct?

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

Q: confidence interval for the proportion of college students who have texted during class was found to…

A: Given

Q: In a random sample of 500 people eating lunch at a cafeteria on various Fridays, it was found that…

A:

Q: Suppose in a recent poll of 1250 randomly selected Californians who took vacations, 132 of them…

A:

Q: Use the formula for a Confidence Interval for Two Proportions to calculate a 95% confidence interval…

A: Confidence interval: The (1-α)100 % confidence interval for proportion p1 – p2 is given by,

Q: Cameron and Bailey each take random samples and construct 90% confidence intervals for the…

A:

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

A:

Q: In a random sample of 500 people eating lunch at a cafeteria on various Fridays, it was found that…

A: Given that Sample size n= 500  Favorable cases x=160 Sample proportion p^=x/n

Q: Two men, A and B, who usually commute to work together decide to conduct an experiment to see…

A: Let d= X (route I travel time)−(route II travel time)d=(route I travel time)− Y (route II travel…

Q: A Gallup Youth Survey in 2001 found that of 501 randomly selected teenagers in the U.S., 271 of them…

A: Given Total number of teenagers selected = 501Number of teenagers said who get along with their…

Q: Suppose that you will be taking a random sample from a population and that you intend to find a 95%…

A: Solution: The confidence interval for the population mean is calculated by using the following…

Q: Suppose that you intend to find a 95% confidence interval for a population mean by applying the…

A: The z value at 95% confidence level from the standard normal table is 1.96.Let σ is the population…

Q: What is the value of Z for this confidence interval?

A: Given,sample size(n)=14795no.of people who said yes=2219no.of people who said no =12576

Q: Find the 98% confidence interval for the difference between the means of the two populations

A: Given that sample size n = 18 Mean difference = 22.9 And SD sd = 2.2 The critical value of t at (n -…

Q: An automotive manufacturer wants to know the proportion of new car buyers who prefer foreign cars…

A:

Q: Seventy-three percent of a sample of 1000 students drive a used car as opposed to a new car or no…

A: Given: Proportion  = 73 % Confidence level  = 80 %

Q: The number of television sets coming off a production line each day is known to have a standard…

A:

Q: A human resource manager wants to see if there is a difference in the proportion of minority…

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

Q: In a recent polI, 200 people were asked if they liked dogs, and 15% said they did. Find the margin…

A: From the provided information, Sample size (n) = 200 15% people said they like dogs that is p̂ =…

Q: A researcher asks 600 people if they received a flu vaccine, and 65% said they did. What is the 95%…

A: From the provided information Sample size (n) = 600 65% said they received a flu vaccine that is…

Q: What value of z should be used to calculate a confidence interval with a 95% confidence level?

A: The z value which is used to calculate 95% confidence interval is defined as P(-zvalue < Z <…

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: Beth wants to determine a 99 percent confidence interval for the true proportion p of high school…

A:

Q: Suppose that you have obtained data by taking a random sample from a population and that you intend…

A: 95% percent confidence interval will give more accurate estimate of µ than 99% confidence interval.…

Q: Identify the y-score for a 99% confidence interval if the sample size is 35.

A: We have to find critical value for given data..

Q: In a sample of 1901 patients who underwent a certain type of surgery, 22% experienced complications.…

A:

Q: An investigator computes a 95% confidence interval for a population mean on the basis of a sample of…

A: To find half of width, We need to calculate 4 times the sample Size.

Q: Alma is estimating the proportion of students in her school district who, in the past month, read at…

A: From the given information, n=50 and x = 32.

Q: What happens in a confidence interval if the size of the sample increases the length of interval

A: WIdth of a confidence interval = W Margin of error = E

Q: Suppose you survey a random sample from a large population. How large must your sample be if you…

A: According to the provided data, the margin of error is 0.06 and the confidence level is 0.98. Since,…

Q: if you increase the sample size and confidence level at the same time. what will happen to the width…

A: The formula for the confidence interval (say) for population mean is :  C.I= x ± zα/2.s2n As the…

Q: Suppose we know that a confidence interval for a population proportion is (0.572, 0.662), with a…

A:

Q: In the previous example, you learned that the 95% confidence interval for the true proportion of all…

A: Calculate the point estimate and margin of error used to create this confidence interval.

Q: A psychologist is studying the effects of lack of sleep on the performance of various…

A: We have to find ci for given data.

Q: A random sample of accountants were asked whether they double-check their calculations on a tax…

A: Here the sample proportion is given by, p^ Therefore α level confidence interval is given by, p^ -…

Q: find tc for a 95% confidence level when the sample size is 6.

A: level of significance, alpha = 0.05from standard normal table, two tailed t alpha/2 with n-1 = 6 d.f…

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: For the same sample statistics, which level of confidence would produce the widest confidence…

A:

Q: A sociologist is comparing the proportion of teenage boys who receive a text message at least once…

A: The  Conditions for the Confidence interval for the difference in population proportions • Samples…

Q: Suppose you compute a confidence interval with a sample size of 37. What will happen to the…

A: If the sample size increases from 37 to 70 then, the margin of error of the confidence interval…

Q: What will happen to the precision of a confidence interval if the variability of a sample gets…

A: Farmula  Length of Confidence interval=2xZcxσ/√n

Q: It was found that in a sample of 90 teenage boys, 70% of them have received speeding tickets. What…

A: Given data ,n=90P=70%=0.7The z-value at 90% confidence is1.645=z∝12=1.645

Q: A student was asked to find a 95% confidence interval for the proportion of students who take notes…

A: It is given that a student was asked to find a 95% confidence interval for the proportion of…

Q: A statistics student wants to conduct a study to determine the proportion of workers in Cititon who…

A:

Q: What would be the standard error in computing a confidence interval for the difference of…

A: It is given that For population 1, sample size n1 = 49, sample proportion = 0.682 For population 2,…

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.