With individual lines at its various windows, a post office finds times for customers on Friday afternoon is 7.2 minutes. The post office experiments with a single, main waiting line and finds that for a random sample of 25 customers, the waiting times for customers have a standard deviation of 3.5 minutes on a Friday afternoon. With a significance level of 5%, test the claim that a single line causes lower variation among waiting times for customers.

Q: An article in the local paper about salaries showed that staff nurses in San Antonio earn less than…

A: From the provided information, Level of significance = 0.01

Q: For a study conducted by the research department of a pharmaceutical company, 260 randomly selected…

A: We have given that Sample mean (x̅1) = 17.80Sample mean (x̅2) = 18.20Sample size (n1) = 260Sample…

Q: Location is known to affect the number, of a particular item, sold by Walmart. Two different…

A: given data x¯1  =  39s1 = 9n1 = 9x¯2  = 51s2 = 6n2 = 13α = 0.05claim : μ1 < μ2

Q: The Discovery Medical Aid Board wanted to find out if the mean time to settle medical claims of…

A: There are two independent samples which are Green-Aid Fund and Explorer Blue Fund. We have to test…

Q: Assume a researcher recruits 150 African American and Caucasian individuals taking warfarin to…

A: Given: n1 = 75 X1 = 6.1 S1 = 1.7 n2 = 75 X2 = 4.3 S2 = 0.9 Sp = 1.10 Formula Used: Sp =…

Q: Walleyes found in lake Windermere have a mean length of 18.4 inches with a standard deviation of 4.2…

A:

Q: or a study conducted by the research department of a pharmaceutical company, 210 randomly selected…

A:

Q: A study was made of a sample of 25 records of patients seen at a chronic disease hospital on an…

A: Given data : Sample size = 25 Sample mean = 4.8 Sample standard deviation = 2 Population mean = 4…

Q: For a study conducted by the research department of a pharmaceutical company, 225 randomly selected…

A: It was stated that a study was conducted on a pharmaceutical company by the research department. A…

Q: An endocrinologist is interested in the effects of depression on the thyroid. It is believed that…

A: Given:

Q: ates, two color variants of the Eastern Gray Squirrel-gray and black-are found in the rrels in a…

A:

Q: For a study conducted by the research department of a pharmaceutical company, 245 randomly selected…

A: Data given n1=245 , sample mean x̄1= 17.8 and s1= 4.3 n2=225, sample mean x̄2=18.2 amd s2= 3.60

Q: A study was conducted to determine the effectiveness of hypnotism on reducing pain. Using standard…

A: Sample 1(before hypnosis): n1=8x¯1=8.713s1=2.177 Sample 2(after hypnosis): n2=8x¯2=5.588s2=2.608

Q: A biologist is interested in comparing the size of blue crabs in two river basins: Cooper River and…

A:

Q: A businessman calculated the average price of variety A rice per kilo at ₱32.00 with a standard…

A: First calculate sample mean and sample standard deviation for rice B varieties using Excel

Q: A marketing study found that the mean spending in 15 categories of consumer items for 150…

A:

Q: For a study conducted by the research department of a pharmaceutical company, 265 randomly selected…

A:

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

A: The following information is provided that is required to compute the sample size: Required…

Q: For a study conducted by the research department of a pharmaceutical company, 205 randomly selected…

A: Given Sample size n1=205, sample mean x̄1=17.6, s1=sample standard deviations=5.3,  n2=sample size…

Q: According to a dietary study, high sodium intake may be related to ulcers, stomach cancer and…

A:

Q: A study was conducted to evaluate the stress level of senior business students at a particular…

A:

Q: Location is known to affect the number, of a particular item, sold by an auto parts facility. Two…

A: GivenFor Location A:-sample size(n1)=13Mean(x1)=39standard deviation(s1)=8For Location B:-sample…

Q: For a study conducted by the research department of a pharmaceutical company, 245 randomly selected…

A: Given  n1=245, x̄1=17.8, s1=4.3  n2=225, x̄2=18.2, s2=3.6

Q: According to a dietary study, high sodium intake may be related to ulcers, stomach cancer and…

A:

Q: The amount of time it takes students to travel to school can vary greatly depending on how far a…

A:

Q: n a scientific study conducted by the Dax Science Lab on Deep Space Nine, 41 male rats were sent to…

A:

Q: For a study conducted by the research department of a pharmaceutical company, 235 randomly selected…

A: Given n1=235 n2=250 X1-bar=17.80 X2 bar=18.20

Q: before and after taking the drug. The sample mean blood pressure before taking the drug was 120 mmHg…

A:

Q: When the manager performed a significance test, the P-value was 0.07. What is the meaning of this…

A: P-value is defined as the probability of getting the difference at least as extreme as we are…

Q: A researcher collected data from Boston police officers and found that on average they spent 14.3…

A:

Q: The credit manager of a large department store claims that the mean balance for the store’s charge…

A:

Q: In one city, the average amount of time that tenth-graders spend watching television each week is 23…

A: GivenMean(x)=21.9population standar deviation(σ)=3.1sample size(n)=95α=0.005

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.