To obtain an estimate of the proportion of ‘full time’ university students who have a part time job in excess of 20 hours per week, the student union decides to interview a random sample of full time students. They want the length of their 95% confidence interval to be no greater than 0.1. What size sample, n should be taken?

Q: Out of a sample of 600 adults aged 18 to 30, 162 still lived with their parents. Based on this,…

A:

Q: Nina would like to estimate the difference in the mean amount of time students spend on math…

A: Total number of sample =30 90% confidence interval for the true difference in the population means,…

Q: Identify the t -scores for a 90% confidence interval if the sample size is 25?

A: Givensample size(z)=25α=1-0.90=0.10α2=0.05

Q: Of 125 adults selected randomly from one town, 28 of them smoke. Construct a 99% confidence interval…

A: It is given that out of 125 adults in one town, 28 of them smoke. That is the value of n is 125 and…

Q: Suppose we wanted to estimate the average amount of sleep (in hours) a college student gets a night.…

A: Confidence interval : Confidence interval is a range of values it contains the true population…

Q: A sociologist wants to construct a 94% confidence interval for the proportion of teenagers who uses…

A: Given, p=0.23 E=0.02 z value at 94% confidence is Zc=1.88 n=?

Q: A sample of 200 found that 43.2% of those sampled consumed more than 2 alcoholic  beverages  a week.…

A: Given:

Q: Out of 400 people sampled, 32 had kids. Based on this, construct a 95% confidence interval for the…

A: Solution: Let X be the number of people had kids and n be the sample number of people. From the…

Q: Suppose that the a college wants to have an idea of the average SAT score of the incoming freshman…

A: The confidence level is 0.90, the standard deviation is 310 and margin of error E is 50.

Q: suppose an individual was studying temperature's effect on crime rate. The researcher looked at 6…

A: Solution:The sample mean is obtained below:From the given information, number of observations is 6…

Q: An accounting firm has 1200 clients. From a random sample of 120 clients, 110 indicated very high…

A: Given : An accounting firm has 1200 clients So,  Population size (N) = 1200 Sample size (n) = 120…

Q: Using the 99% level of confidence, what is the confidence interval for proportion of students…

A: Let X be the random variable such number of students attending home football games. X = 750 N: Total…

Q: The university is trying to estimate the percentage of students who failed more than two courses. In…

A: Step-by-step procedure to obtain the value of  using STATKEY:Choose Normal under Theoretical…

Q: Out of 200 people sampled, 42 had kids. Based on this, construct a 95% confidence interval for the…

A: For 95% confidence intervalα=1-CI=1-0.95=0.05So, zα2=z0.052=z0.025=1.96

Q: m what their favorite color was. 23 people said their favorite color is blue. Using this sample,…

A: Sample proportion is the fraction of successful samples and total number of samples. Here,  Total…

Q: Increasing the sample mean would cause a confidence interval to (a) shift left (b) shift right (c)…

A:

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: We want to estimate the proportion of vegetarian restaurants in a country. We observe 20 such…

A: We observe 20 such restaurants out of 100 p⏞ =xn=20100=0.5 90% confidence interval for the…

Q: (b) Suppose you wanted to use the sample data to decide if there is evidence that the average time…

A: Given information  Claim :  Average time spent playing video or computer games for male Canadian…

Q: In a survey of 2255 randomly selected US adults (age 18 or older), 1787 of them use the Internet…

A: We want to calculate the 90% confidence interval for each of the following proportions

Q: During the nutrition research, the amount of consumed kilocalories per day was measured for 18…

A: For Women     The 90% confidence interval for women is (1753,1951) .

Q: If n=590 and p=0.93, construct a 90% confidence interval.

A: Express the expression for the confidence interval. C.I=p±Z*p(1-p)n Here, Z* is the critical value .…

Q: Last year your professor taught economics courses to N = 200 students. From this group you randomly…

A:

Q: If the sample mean is 70 and the standard error of the sample mean is 8, what will be the 90%…

A:

Q: Out of 200 people sampled, 10 had kids. Based on this, construct a 95% confidence interval for the…

A: Sample size Out of which  had kids.The objective is to construct  95% confidence interval for the…

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: During the nutrition research, the amount of consumed kilocalories per day was measured for 18…

A: Confidence interval is the combined value of sample statistic and the margin of error. Margin of…

Q: Out of 100 people sampled, 44 have lied to a family member in the past month. Based on this,…

A:

Q: 5. At Community Hospital, the burn center is experimenting with a new plasma compress treatment. A…

A: It is given that  For sample 1: Favourable cases, X1 = 259 Sample size, n1 = 316 For sample 2:…

Q: If n= 220, p-hat= .4, then what will be the 87.4% confidence interval for the population proportion?

A:

Q: From a lake, an unknown proportion of fish have been tagged.  You collect a sample of 100 fish taken…

A:

Q: 7. A recent survey of 500 women indicated that 29% of women over age 55 in the study were widows.…

A: Givensample size(n)=500p^=29%=0.29confidence level=90%

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

A: If the sample size increases, then the standard error of statistic decreases. The margin of error is…

Q: 2. A group of students working on their thesis took a random sample of 100 families in a certain…

A: Given Sample size=100, sample mean x̄=1146, sample standard deviations s=650  Construct 90% CI for…

Q: Suppose we wish to construct a 95% confidence interval for the population proportion of fans in…

A: Given that, Total fans = 200 130 answered yes 95% confidence level

Q: 2.) A survey of 200 college students revealed that 160 of them eat dessert daily. Construct a 95%…

A:

Q: If n = 220, p-hat = 0.4, then what will be the 90% Confidence Interval for the population…

A:

Q: Researchers are interested in the average heart rate of male college students. Assume a random…

A: Here, the sample proportion, p^ is 0.65 =130200 and the sample size, n  is 200. Using standard…

Q: A Gallup poll of 1487 adults showed that 43% of the respondents have Facebook pages.  Construct a…

A: Confidence Interval: In statistics, we can say a range of values of the specified population…

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.