* For Questions (11)-(13): A group of 15 smokers were asked about th number of cigarettes they smoke per day. Sample data were as follows: No. of cigarettes No. of smokers 17 20 22 3 5 10 15 1 4 (11) The sample mean (a)5 (b)3 (c) 16.8 (d) 17.87 (12) The sample standard deviation (a) 3.33 (b) 11.06 (c) 3.44 (d) 11.85 (13) The sample interquartile range (b) 7 (a) 5 (c) 1 (d) 4

Q: 3. According to CHED, college professors work an average of 30 hours per week during a semester. A…

A: Given that, population mean = 30 sample mean = 35  number of sample = n = 26 sample standard…

Q: A large corporation employs 21,995 individuals. The average income of all employees is $64,372, with…

A: From the given information it is clear that,  Sample size n=180 Average income of all employees is…

Q: For a sample of five different years from the period 1960 through 2007, it is found that U.S work…

A: Given: A sample of five different years that is included with the period of 1960 through 2007, with…

Q: The number of semester hours of college credit taken by CFA candidates has a distribution with a…

A: Hey, since there are multiple subparts posted, we will answer first three question. If you want any…

Q: A sample of 90 items has mean 55 and standard deviation 3. A second sample of 110 items has mean 60…

A:

Q: In 2011, the number of text messages sent and received by teenage girls (ages 12–18) was strongly…

A: 1. It is given that the mean and standard deviation are 165 and 45, respectively. By using central…

Q: The mean TOEFL score of international students at a certain university is normally distributed with…

A: The provided information is µ=490 σ=80 n=30   The mean and standard deviation for the sample means…

Q: In a day, the call money rates were taken from 10 banks in Mumbai that has given a mean rate of…

A: Given : Claim : The average rate is significantly higher than that of the claim of analyst.

Q: In a past election, the voter turnout was 57%. In a survey, 934 subjects were asked if they voted in…

A:

Q: To test the theory that the consumption of red meat has decreased over the last 5 years, a…

A: Given: x¯1=34s1=13n1=400x¯2=31s2=14n2=400

Q: The mean serum-creatinine level measured in 12 patients 24 hours after they received a newly…

A: Note:  As per the company guidelines only 3 subparts can be answered.  Kindly, resubmit the question…

Q: Pressure values measured by various probes in the test section of a wind tunnel to obtain the…

A: Given information: The data represents the values of readings of 9 measurements.

Q: Using the empirical rule, identify the range of values around the mean that includes 95% of sales…

A: Let , X→N(μ=31.6 , σ=7.5) Using the empirical rule, identify the range of values around the mean…

Q: The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million…

A: We have given that  Sample sizes n1= 40 , n2= 35  Sample means xbar1= 3.2 , xbar2=1.9  Standard…

Q: Suppose that Sacramento workers have a mean commute of 17 minutes and commute times are normally…

A:

Q: A negatively skewed population with a mean of 181 and a standard deviation of 84 What is the mean…

A: GivenMean(μ)=181standard deviation(σ)=84

Q: 3. An extensive study of the cost of health care in the United States presented data showing t the…

A:

Q: Mrs. Bracken asks a random sample of 500 adults whether they favor giving vouchers to parents of…

A:

Q: 2. A school district is trying to determine if its standardized test scores are higher than the…

A:

Q: Suppose that a study of elementary school students reports that the mean age at which children begin…

A:

Q: 7. A recent report of the average age of robbery victims stated that the mean age was 63.5 with a…

A: Given,sample size(n)=30sample mean(x¯)=61.9population standard deviation(σ)=1.9population…

Q: Suppose 2% of students drink more than 3 cups of coffee each day. To check this claim, a researcher…

A:

Q: 7. The average local cell phone call length was reported to be 2.27 minutes. A random sample of 20…

A: Given data: Mean =2.27 minutes Sample size = 20 Sample average  = 2.98 Sample standard deviation =…

Q: The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million…

A: From the provided information,

Q: The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million…

A: The sample standard deviations are s1=2 and s2=1.5.

Q: Suppose that among the population of smartphone owners with 16GB of storage, the mean amount of…

A: From the provided information, Mean (µ) = 13 GB Standard deviation (σ) = 3 GB

Q: A marketing study was conducted to compare the variation in the age of male and female purchasers of…

A: According to the given information, we have Female: Sample size = 31Sample mean = 50.30Sample…

Q: Company ABC's customer retentions per site are normally distributed with a standard deviation of 21…

A: Solution: Let X be the Company ABC’s customer retentions per site. From the given information, X…

Q: 4. In a spelling contest, the mean mark of the 32 boys was 72 with the standard deviation of 8 while…

A:

Q: marketing study was conducted to compare the average age of male and female buyers of a certain…

A: We want to conduct a test to determine whether the mean age of all female buyers is higher than the…

Q: Suppose that a study of elementary school students reports that the mean age at which children begin…

A: Central Limit Theorem:If a random sample of size n is taken from a population having mean  and…

Q: The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million…

A: Central limit theorem states that as the sample size become large(>30), the distribution of…

Q: Question 3 (a) According to a recent survey, Americans get a mean of 7 hours of sleep per night. A…

A:

Q: 4. All freshmen in a certain school were found to have variability in grades expressed as a standard…

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

Q: The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million…

A: The standard deviations are sn=2 and sr=1.5.

Q: The daily revenue at a university snack bar has been recorded for the past five years. Records…

A: From the provided information, Mean (µ) = $1200 Standard deviation (σ) = $400 Sample size (n) = 100

Q: The mean score on the exit examination for an urban high school is 66with a standard deviation of…

A: Given  μ=66, σ=6, n=9  We want to find the sample mean(x̄)

Q: I am trying to do a Pooled standard deviation = (n1-1)s1²+(n2-1)s2²/(n1=n2-2), however, I am having…

A:

Q: Heights for women are bell-shaped with a mean of 65 inches and a standard deviation of 2.5 inches.…

A:

Q: Suppose a English lecturer believes that there is no significant difference between the average…

A: Denote μ1, μ2 are the true average class scores of mekar and mawar on final exam, respectively.

Q: The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million…

A: It is given that For baseball players, mean1 = 3.2 and SD1 = 2 For football players , mean2 = 1.9…

Q: You have obtained the number of years of education from one random sample of 38 police officers from…

A: Solution: Given information: n1= 38 Sample size of city An2= 30 Sample size of city  B x1= 15 Sample…

Q: 1)The analysis of the results of budget survey of 150 families gave an average monthly expenditure…

A: It is given that: The analysis of the results of budget survey of 150 families gave an average…

Q: random sample of 30 police officers from City B. The average years of education for the sample from…

A: The following information has been provided: Sample Mean 1 (\bar X_1)(Xˉ1​) = 1515 Sample…

Q: 12, and sample size is 7.  For more than one gadget: The mean is 79, standard deviation is 13, and…

A:

Q: 2) A restaurant association claims that the average amount a family spends per year eating out is…

A:

Q: The average "moviegoer" sees 8.5 movies a year. A moviegoer is defined as a person who sees at least…

A: Given Average =9.9 Sample SD=3.2 n=42 μ=8.5

Q: For a large Internet seller their average customer spent $51.28 during the Black Friday sale with a…

A: Solution

Q: The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million…

A: According to the central limit theorem, when a sample of size n is drawn from any population with μ…

Q: 7) Pressure values measured by various probes in the test section of a wind tunnel to obtain the…

A: Given:

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.