The efficiency expert at a computer company tested 40 engineers to estimate the average time it takes to assemble a certain computer component, getting a mean of 12.73 minutes and S.D of 2.06 minutes.

Q: Two groups of students reported mean weights of 162 kgs and 148 kgs respectively. When would the…

A:

Q: a sample of Computer usage for 40 studente showed a sa mphe Mean of 6.2 hours, If we know that J =…

A: Given data, Sample = 40 sample mean = 6.2 population standard deviation = 2.4 Confidence interval =…

Q: The use of the Internet is constantly growing. How many randomly selected adults must be surveyed to…

A: Solution

Q: A researcher is analyzing data from a repeated-measures research study. If the researcher ran a…

A: The difference is, Subject 1st 2nd Difference #1 10 11 -1 #2 4 6 -2 #3 7 9 -2 #4 6 5 1…

Q: What is the excel formula for this? What is the margin of error for a 90% CI for a mean, when the…

A: v

Q: A manager wants to see if geographical region (Cape Town, Durban and Gauteng) is related with…

A: Given: Chi square test statistic = 0.412 Assumed significance level = 0.05

Q: A researcher wants to know if there is a difference between the mean amount of sleep that people get…

A: 2. Excel Procedure: Enter the data for Part Time, Unemployed and Full Time in Excel sheet>…

Q: What is the residual sum of squares around the fit for a dataset with an r^2 of 1?   If the sum of…

A: We know  R2=Explained sum of squaresTotal sum of squares⇒1=Explained sum of squaresTotal sum of…

Q: 3. How was the data collected?

A: Data collection is an important part because the whole analysis will depend upon the collected data.…

Q: In a sample of n=6 scores, five of those scores are each above the mean by one point. Where is the…

A: The formula for mean is given as: X¯=1n∑Xi We are given that: n=6X1=X2=X3=X4=X6=X¯+1

Q: Mr. X. wants to determine on the basis of sample study the mean time required to complete a certain…

A:

Q: In a sample of 4972 car owners, 2326 said that they would seriously consider purchasing an…

A: Given  n=4972, X=2326 Point estimate=p^

Q: How to interpret the result according to the above data?

A: Decision Rule: Reject H0 if p value less than or equal to α. Let us consider, α=0.05. From the given…

Q: The population Mean is 125 with a st dev of 22.However , the population distribtuon is skewed to the…

A:

Q: A sample of n=8 scores has a mean of M=7. If one score is changed from X =20 to X =4, what is the…

A: Consider the first 7 scores is x1, x2, x3, x4, x5, x6, x7 and the 8th score is, x8=20. The formula…

Q: Can you statistically put that something is within the 100th percentile? For examlpe a z-score of…

A: 100th percentile means that you have the highest test score possible. 100th percentile means you've…

Q: Are any of the leaf measurements from the table the same as the mean? How many of the leaves were…

A: Given Sample size, n=20 Oak-Leaf Lengths: 78,69,62,74,69,51,45,40,9,64,65,64,61,69,52,60,66,71,72,27…

Q: People who live near a former rocket-tes are concerned that perchlorate is preser unsafe amounts in…

A: mean = 24.5 n = 28 sample mean = 25.3

Q: The length of time a particular smartphone's battery lasts follows an exponential distribution with…

A: We know that the  The Sum of exponential variate is defined as Gamma variate i.e. if X1, X2,...,Xn…

Q: The data for an independent –measures research study produced a sample mean difference of 6 points…

A: Following information is given:

Q: Suppose you wish to find the average annu salary for school teachers in the United States. You…

A: Given data,Mean μ=53145sd    σ=16451n=31Find 95% CI?

Q: A survey of 100 fatal accidents showed that in 43 cases the driver at fault was inadequately…

A: We have given that , A survey of 100 fatal accidents showed that in 43 cases the driver at fault was…

Q: For a sample of 9 with a mean of 5994. How would i find the EX?

A:

Q: From a sample of 500 items, 30 were found to be defective. The point estimate of the population…

A: The point estimate of the population proportion is the sample proportion. The formula for point…

Q: If you choose to work with a t-score, how many degrees of freedom would you have?

A: Here given  Sample mean = 87 Sample size = n = 25

Q: One sample of n = 4 scores has a mean of M = 12, and a second smaple with n = 6 scores has a mean of…

A:

Q: The P-value for this chi-square statistic is

A: Given : Degree of freedom is calculated by using the following formula:DF = (r-1)(c-1)WhereDF =…

Q: A sample of people attending a professional football game averages 13.7 years of formal education.…

A: Given information: A sample of people attending a professional football game averagesX¯=13.7 The…

Q: Pandora, the owner of a food delivery app, knows from experienc assemble a food delivery is normally…

A: Food delivery time is normally distributed with mean 30 and standard deviation is 5 μ=30σ=5

Q: A group of scientists are interested in finding out whether the days of rainfall during the spring…

A: Given: number of days of rainfall amount of maple syrup

Q: Consider this question: What is the expected number of failures in 100 launches of a rocket that has…

A: Introduction: A random variable can be said to have the geometric distribution, if it counts either…

Q: A researcher selects all of the possible samples with n = 8 scores from a population and computes…

A: The mean of the sampling distribution of the sample mean is an unbiased estimator for population…

Q: 300 books were selected at random from a library. If the mean length of books in this sample was 150…

A: Given that total books, n= 300 Mean, X bar= 150 and  Variance, sigma= √100 = 10 We know that z…

Q: A weight-loss clinic advertised that last month its patients, on average, lost 7 lb. Assuming that…

A: Here Given  Weight loss clinic advertised that last month its patients On average lost 7 lb.

Q: A physician recorded the number of seizures that each of 20 patients with severe epilepsy had during…

A: Introduction: It is required to identify the observational units and the population being studied.

Q: When computing a 95% CI for a population mean, the ____ is used as the point estimate.

A: Given that  When computing a 95% CI for a population mean, the ____ is used as the point estimate.…

Q: A survey of 120 fatal accidents showed that in 24 cases the driver at fault was inadequately…

A: Point estimate:   The population parameter which is estimated by using sample statistic is termed as…

Q: By how many times does the sample size have to be increased to decrease the margin of error by a…

A: Margin of Error- In the theory of probability and statistics, there is a inverse relation between…

Q: Based on the hourly incomes (in US dollars) of employees in two different branches at Citibank,…

A: Variability refers to the spread of the data . It allows us to compare two datasets.

Q: The first four deviations from the mean in a sample of n = 5 reaction times were .3, .9, 1.0, and…

A: It is given that, n=5 and  First four deviations from the mean for reaction time is 0.3,0.9,1.0,1.3…

Q: A sample of n = 5 scores has a mean of M = 12. If one person with a score of X = 8 is added to the…

A: Given n = 5 mean = 12

Q: How many Biology students’ records need to be sampled to estimate the percentage who earn "A"s to…

A: The proportion is not provided therefore in worst case it can be assume as (p) 0.5. Margin of error…

Q: A recent study showed that the cost of buying a typical shopping basket of 40 food items for…

A: Given data is 8100,6600,6150,5100,4900Arrange the data in ascending…

Q: A consultant for a large university studied the number of hours per week freshmen watch TV versus…

A: Let μ1 denotes the mean number of hours per week freshmen wash TV, and μ2 denotes the mean number of…

Q: If 10 men in a company have an average annual salary of GH¢360,000 and 23 women have an average…

A: The mean is the sum of a collection of numbers divided by the count of numbers in the collection. 10…

Q: How is the goal served by computing a measure of variability?

A: We need to find the goal served by computing a measure of variability

Q: A consumer group claims that the mean annual consumption of cheddar cheese by a person in the U.S.…

A: Claim: The claim is that the mean annual consumption of the cheddar cheese by a person in US is at…

Q: Fifty people are selected randomly from a certain population and it is found that 12 people in the…

A: Sample size = n = 50 Sample number of events = x = 12 Sample proportion = p̂ = x/n = (12/50) =…

Q: By how many times does the sample size have to be increased to decrease the margin of error by a…

A: Need to find By how many times does the Sample size have to be increased to decrease the margin of…

Q: The formula is applied for computation of Mean when data is in Raw form?

A: