3.In a random sample of 170 customers, 90 ordered chicken sandwitches for lunch. Construct a 94% confidence interval for the true proportion of customers who buy chicken sandwitches for lunch

Q: Of 500 random people surveyed, 72 were smokers.  Find the 95% confidence interval. SE=0.0157

A:

Q: A research scientist wants to know how many times per hour a certain strand of bacteria reproduces.…

A:

Q: An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city…

A:

Q: n = 260 and X = 208, construct a 90% confidence interval for the population proportion, p. Give…

A: Given data,x=208n=260p^=xn=208260=45=0.80

Q: The weights of packs of chewing gum for a certain brand have a mean of 47.1 grams and a standard…

A: Positive z score shows the number of z Sd above the mean or heavier than the mean by z standard…

Q: Listed below are the blood pressure measurements taken from the right and left arm of 5 patients.…

A: From the provided information, The mean and standard deviation of the right arm data can be obtained…

Q: A survey of 81 individuals finds that the average amount they spend on entertainment each month is…

A: Given  n=81, Xbar=145,s=54 We want to find 95% CI for population mean

Q: 2. A recent study of 25 students showed that they spent on average of $18.35 for gasoline per week.…

A: Given  x̄ = 18.35 n=25 s=3 degree of freedom = df = n -1 = 25-1 = 24 significance level α = 0.10…

Q: The ages of the population of 2,000 women are normally distributed with a mean of 35 years and…

A: Given: The ages of the population of 2,000 women are normally distributed with a mean of 35 years.…

Q: Suppose that a certain brand of light bulbs has a mean life of 600 hours and a standard deviation of…

A: Solution: Let X be the lifetime of a bulbs. From the given information, X follows normal…

Q: To interpret his finding, he needs to calculate the probability that a sample of 25 graduates would…

A: Let X is the random variable of the salary of the school’s graduates one year after graduation.…

Q: The manager of "Frenchies" is concerned that the patrons are not consistently receiving the same…

A: Solution: From the given information, the sample variance is S=1.7, population standard deviation is…

Q: 15. A random sample of 100 visitors to a popular theme park spent an average of $142 on the trip…

A: SOLUTION: Given average x=142          standard deviation σ=47.5          random sample n=100

Q: In a survey, 21 people were asked how much they spent on their child's last birthday gift. The…

A: we have given that  sample size n=21  ,xbar=30.9 ,s=12.7 margin of error= E = tcritical . s/sqrt (n)

Q: An admission officer of a small liberal arts college wishes to compare the mean admission test…

A: Given: n1= 15 ,x̄1= 495.0 ,s1= 55.0 n2= 17 ,x̄2= 545.0 ,s2= 50.0 At 95.0 % confidence level with…

Q: many samples) gave a mean date of ?1 = year 1261 with standard deviation ?1 = 38 years. At a second,…

A: The z score formula: Now, for z 1 : z1 = ( 1207 − 1261 ) 38   =− 1.42

Q: Find 95% confidence interval for the population mean, if the sample size is 40, the sample mean is…

A:

Q: sample of 16 students was taken from university. These students spent an average of $170 on books…

A:

Q: e chips per cookie for Big Chip cookies? Round your answers to one decimal place.

A: Let X be the random variable such that number of chocolate chips per cookie for Big Chip cookies x̅:…

Q: A random sample of 49 shoppers showed that they spend an average of $23.45 per visit and the…

A: 1. Point estimate of the population mean is the sample mean.

Q: A survey was conducted that asked 1007 people how many books they had read in the past year. Results…

A: given that,sample mean, x =12.2standard deviation, s =16.6sample size, n =1007standard error = sd/…

Q: 9. 9. In a survey, 25 people were asked how much they spent on their child's last birthday gift.…

A:

Q: Which of the farms are unusual (more than two standard deviations from the mean)? S

A: Given that Mean = 1600 And SD = 300 Also the distribution is bell shaped.

Q: estimate the mean age of all students currently enrolled. In a random sample of 20 students the mean…

A: Solution

Q: The manager of "Frenchies" is concerned that the patrons are not consistently receiving the same…

A:

Q: Suppose that, for a certain exam, a teacher grades on a curve. It is known that the mean is 50 and…

A: Given mean is 50 and the standard deviation is 5. There are 35 students

Q: d. Calculate the test statistic as identified in "c" above. e. What is the p value associated with…

A: The sample size is 200, sample mean is 75, sample standard deviation is 20, and population mean is…

Q: . A sample of 84 WCC students found mean age 24.7 years old with standard deviation 7.9 years old.…

A:

Q: Construct a 95% confidence interval for the population mean, μ. Assume the population has a normal…

A:

Q: These babies will have a mass of less than how many pounds?

A: Given that masses of newborns are normally distributed with a mean of 6.6 lbs. and a standard…

Q: In a survey, 19 people were asked how much they spent on their child's last birthday gift. The…

A: From the provided information, Sample size (n) = 19 Sample mean (x̄) = $46 Sample standard deviation…

Q: In a survey, 16 people were asked how much they spent on their child's last birthday gift. The…

A: We have given that,  Sample mean (x̄) = 50.2, sample size (n) = 16 and standard deviation (s) = 11.2…

Q: In a survey, 27 people were asked how much they spent on their child's last birthday gift. The…

A: The mean is $36 and the standard deviation is $6.

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

A:

Q: The accounts of 4,500 credit card customers out of a sample of 40,000 that were reviewed did not…

A: The sample size of review credit card customers: The number of unsatisfactory performers from the…

Q: . Estimate the mean with an approximate 95% confidence interval. The magazine estimates the true…

A: Let X  be the random variable such that  salary of the magazine's subscriber   x̅ : Sample mean of…

Q: Suppose a waitress keeps track of her tips, as a percentage of the bill, for a random sample of 60…

A:

Q: At a certain gas station, the amount of gas purchased per vehicle follows a normal distribution with…

A:

Q: A simple random sample of 43 men from a normally distributed population results in a standard…

A: The chi-square test for variance is a non-parametric statistical procedure with a…

Q: A professor at a university gives her large class an examination and finds that the scores follow…

A: mean = 73 sigma = 8

Q: Tree-ring dates were used extensively in archaeological studies at Burnt Mesa Pueblo. At one site on…

A:

Q: .Find 95% confidence interval for the population mean, if the sample size is 64, the sample mean is…

A: It is given that Sample size n = 64 Sample mean M = 508 Sample SD s = 28 The critical value of t at…

Q: Miss Romero noted that the mean scores of a random sample of 15 Grade 8 students who had taken a…

A: Given: Sample size, n=15 Let PE denote point estimate Sample mean, x¯=80.5sample standard deviation,…

Q: According to the Center for Disease Control and Prevention (CDC), the mean life expectancy in 2015…

A:

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.