Suppose a retailer claims that the average wait time for a customer on its support line is 185 seconds. A random sample of 53 customers had an average wait time of 177 seconds. Assume the population standard deviation for wait time is 53 seconds. Using a 95% confidence interval, does this sample support the retailers claim?  A) Yes, because the retailers claim is beteeen the lower limit of __ seconds and the upper limit of __ seconds for the mean wait time.  B) No, because the retailers claim is not between the lower limit of __ seconds and the upper limit of __ seconds for the mean wait time.

Q: Suppose that Felisha is a librarian, and she read in a scholarly journal that the number of words in…

A: Obtain the margin of error of a 99% confidence interval for the mean number of words in all…

Q: Assuming that these five students can be considered a random sample of all students participating in…

A: The values of sample mean and standard deviation are,

Q: Suppose that a random sample of sixteen recently sold houses in a certain city has a mean sales…

A:

Q: You randomly select 20 cars of the same model that were sold at a car dealership and determine the…

A: Answer:- Given, Sample size, n = 20  Sample mean, X¯= 9.75  Sample standard deviation, S = 2.39…

Q: A graduate Statistic Student wants to estimate the true proportion of county college ( "c.c.")…

A: we have given that  sample size N=100 ,favorable cases X=64 sample proportion P^=X/N

Q: Assume that 66 % of single women and 81.9 % of single men own cars. Also assume that these estimates…

A: Given data, p1=66%=0.66 n1=1640 p2=81.9%=0.819 n2=1800 z-value at 99% confidence is Zc=2.576

Q: a recent survey at a small Midwestern college, 39 of 140 randomly selected students revealed that…

A: Here it is given that- total number of observations(n) = 140 Proportion (p) = 39140= 0.28 So, q =…

Q: Suppose that the number of students passed a Statistics class are normally distributed. A simple…

A:

Q: In a random sample of 500 people eating lunchbat a cafeteria on various fridays, it was found that…

A: Given X=160 n=500 P=X/n

Q: A random sample of 200 BZU students shows that 80 of them have O blood type. Let p be the BZU…

A: There are totally 200 BZU students are sampled in which 80 of them have blood type. The variable p…

Q: a) A new machine is used to pack coffee powder. The mass of a packet follows a normal distribution…

A: The mean and standard deviation for the sample data are computed as follows:

Q: An analyst is conducting a hypothesis test to determine if the mean time spent on investment…

A: The point estimate is=sample mean=2.5 sample standard deviation=s=2 sample size=n=64 confidence…

Q: Suppose that the population of the number of hours slept by all college students the night before…

A: The sample size is 19, sample mean is 6.818, and sample standard deviation is 2.017.

Q: In an effort to estimate the mean amount spent per customer for dinner at a major Atlanta…

A: The following information is provided:

Q: A college admissions officer takes a simple random sample of 96 entering freshmen and computes their…

A: We have to find out lower confidence interval...

Q: n article in the San Jose Mercury News stated that students in the California state university…

A: (1) Given: s =1.2 The degrees of freedom is, Df =n-1=38-1=37 The critical t-value corresponds to…

Q: In a study of the lifetimes of electronic components, a random sample of 400 components are tested…

A: Note: Hey, since multiple subparts are posted, we will answer first three subparts according to our…

Q: An engineering management intern was tasked with estimating the proportion of late shipments leaving…

A: Number of sample observations n=121number of favorable cases =98

Q: 4. Assume that 66 % of single women and 81.9% of single men own cars. Also assume that these…

A: From the provided information,

Q: ) Which distribution table will be used to find the critical value and why? A.) t-table because…

A:

Q: Calculate 95% confidence intervals for the proportion of dwellings in this city that use oil for…

A: It is given that  Sample size = 1000 Favourable cases, X = 228 Sample proportion, p^ = 228/1000 =…

Q: A sample of 50 employees is found to have a mean of $32474 and a standard deviation of $1334. A)…

A:

Q: 10). A sample of 35 different payroll departments found that employees worked an average of 240.6…

A:

Q: Consultant for an association of personal directors wants to find out what proportion of clerical…

A: Given, Sample size, n= 400 And X= 200 Proportion, p= X/n p= 200/400 = 0.5 q= 1-p = 1-0.5 = 0.5 Mean=…

Q: A sociologist develops a test to measure attitudes about public transportation and 11 randomly…

A: Given information :Mean(xˉ)=76.2s=21.4n=11c=95%=0.95Step 2:The margin of error calculated by the…

Q: 5. Assume that in a sample 450 term papers 47% of term papers were longer than two pages. Provide a…

A: Givensample size(n)=450sample proportion(p^)=0.47confidence level=98%

Q: A random sample of high school students is used to estimate the mean time all high school students…

A: Solution: From the given information, a 99% confidence interval is 1.7 hours to 3.1 hours.

Q: What is the point estimate from this sample?

A: Given that 95% confidence interval for the true mean weight of the candy bars is 0.994 to 0.998…

Q: According to a reputable source, the average annual salaries of men and women over the age of 25 who…

A: Given information: x¯1=58102x¯2=41804n1=180n2=195σ1=3180σ2=3890 a) 99% confidence interval for the…

Q: A smartphone manufacturer is interested in constructing a 90% confidence interval for the proportion…

A:

Q: A researcher has collected the blood samples of 29 individuals and found that the mean hemoglobin…

A:

Q: suitable apples. There is a 95% probability that the true mean number of apples per tree is between…

A: Given : A farmer of a large apple orchard would like to estimate the true mean number of suitable…

Q: 4) A college admissions officer takes a simple random sample of 100 entering freshmen and computes…

A:

Q: Suppose that the number of students passed a Statistics class are normally distributed. A simple…

A:

Q: A simple random sample of size n=450 individuals who are currently employed is asked if they work at…

A: From given data we have : n=450 x=27 so, Point estimate is  p^=xn  =27450  =0.06

Q: In a sample of 600 Ottawa families, it is found that 360 rent their dwellings while 240 own their…

A: It is given that sample size (n) is 360 and x is 240.

Q: he AC breakdown voltage of an insulating liquid indicates its dielectric strength. The following are…

A: Obtain the 95% confidence interval for the true average breakdown voltage. The 95% confidence…

Q: A researcher is conducting a study to determine the mean trough dosage of medication for a…

A: Given, Population standard deviation (σ) = 40 mg Margin of error (E) = 10 mg Confidence level = 95%

Q: In a sample of 56 tax returns filed by local hotel managers in a recent year, the taxable incomes…

A: Given: n=56 Mean= 41225 Standard deviation = 6112

Q: According to the February 2008 Federal Trade Commission report on consumer fraud and identity theft,…

A: The number of identity theft complaints is, x=373The total number of complaints is n=1460The defined…

Q: If 64 out of 320 people received fruit in addition to candy what are the 95% confidence interval…

A:

Q: Calculate the mean and standard deviation of Height for the entire sample and for men and women…

A: In this case, 0 denotes male and 1 denotes female. We are using MINITAB software to find the mean,…

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.