A consumer group plans a comparative study of the mean life of four different brands of batteries. Ten batteries of each brand will be randomly selected and the time until the energy level falls below a pre-specified level is measured.

Q: The mean waiting time for customers in a single line is minutes.

A: We have to find Mean and Median for each of the samples.   Single Line : 6.4, 6.6, 6.7, 6.8, 7.1,…

Q: A study of 2700 college students in the city of Pemblington found that 14% had been victims of…

A: The set or collection of all possible observations is defined as the population. The proper subset…

Q: A blood glucose lowering drug given to 4 subjects with Ho: Has 0 and at a = 0.05. The following data…

A:

Q: What percent of patients received pamidronate? What percent of patients experienced the occurrence…

A: Let us define some events A : patient receive pamidronate. B : patient experiences the occurrence of…

Q: When the mean time between failures (MTTR) approaches zero, what happens to availability? Is this a…

A: When the mean time between failures (MTTR) approaches zero, what happens to availability.

Q: What happens to availability if the mean time between failures (MTTR) gets close to zero? Is it…

A:

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: If a study determines the difference in average salary for subpopulations of people with blue eyes…

A: As the study determines that the difference in average salary for sub-populations of people with…

Q: Which one of these graphs does not represent a normal distribution?

A:

Q: The mean age of a group of teachers representing a school at a conference is 40 years old. If the…

A:

Q: A battery manufacturer claims that the mean life of a particular type of their batteries is 500…

A: Since , the sample size is 30. Here , we want to test the claim that the actual mean battery life is…

Q: o check the activation level of data scientists, a population of data scientists was asked to play…

A: (a) State the hypotheses.

Q: If the variance of a national accounting examination is 828, how large a sample is needed to…

A: Given data: Variance  = 828 Margin of error = 4 points Confidence level = 99 % To calculate the…

Q: What proportion of the sample reported that they had been cyberbullied?

A: Givensample size(n)=14795No.of respondents say yes they had been cyberbullied(x1) = 2219No.of…

Q: Can a variable that is measured at the ordinal level be grouped into a small number of intervals in…

A: Introduction:A grouped frequency distribution can be constructed from a raw data, by finding the…

Q: If we have a data set containing the age and marital status of large group of individuals and we ask…

A: Independent samples t test: The independent samples t-test can be used to examine a possible…

Q: at a 0.10 significance level?

A: No treatment  Fertilizer  Irrigation  Fertilizer and irrigation  1.212 0.939 0.069 0.852…

Q: Calculate the mean number of sentences recalled for each of the two conditions. Do the data suggest…

A: Here it is asked to calculate the mean number of sentences recalled. And asked to check ,the data…

Q: A population with µ = 58  and σ = 12 is transformed into z-scores.  After the transformation, what…

A: It is given that a population with mean is 58 and the standard deviation 12.

Q: A study by a reputable research group captured multitasking activities of adults who use different…

A: Given information: It is given that in a group of study 320 of 442 use smartphones, 192 of 350 use…

Q: what is a statistical model

A: A statistical model is process of applying statistical analysis to the given data set and it…

Q: In a clinical trial, 780 participants suffering from high blood pressure were randomly assigned to…

A: From the given information, In a clinical trial, 780 participants suffering from high blood pressure…

Q: In which class does the quartile 1 located?

A: Solution-: We have given the following table: Class No. Class Intervals Class Boundaries Lower…

Q: A sample with a mean of  8 has ∑ x = 72. How many scores are in the sample?

A:

Q: An examinee of the National Medical Admission Test (NMAT) got a percentile rank of 95%. What does…

A: Given that an examinee of National Medical Admission Test (NMAT) got a percentile rank of 95% .

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: What is the average IQ of these subjects?

A:

Q: A mean is known as a statistic if it is computed from the: Opopulation. parameter. sample.

A:

Q: A study by a reputable research group captured multitasking activities of adults who use different…

A: Given information: It is given that in a group of study 320 of 442 use smartphones, 192 of 350 use…

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: Four amateur miniature golfers attempt to finish 100 holes under par several times. Each round of…

A:

Q: A method of gathering data when people are asked a series of questions that can be administered by…

A: In a survey, we ask various questions or series of questions by making questionnaires. This…

Q: Make up a data set with 10 numbers that has a positive correlation?

A:

Q: Researchers wished to know if they could conclude that two populations of infants differ with…

A:

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: You are planning a cross-sectional study of the impact of chocolate milk shake drinking on obesity…

A: Sensitivity and Specificity: While measuring the effect of any given factor on a particular disease,…

Q: What measure of central tendency is calculated by adding all the values and dividing the

A: Common measures of central tendency are 1)Mean  2)Medin 3) mode

Q: Prove an efficient estimator for the average of a normal population

A: X~ Normal with mean= mu and variance= sigma^2 Find efficient estimator for the mean

Q: Dr. Xyz claims that the average salary of workers in Jones is P35,000. A random sample of 100…

A: Given: Mean to be tested, μ=35000Sample size, n=100Sample mean, x¯=40000

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: USA Today reported that the state with the longest mean life span is Hawaii, where the population…

A: Denote μ as the population mean life span.

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: The manager of a fleet of automobiles is testing two brands of radial tires and assigns one tire of…

A:

Q: ANOVA does the following EXCEPT: *

A: here compare given options with characteristics of ANOVA

Q: The Agency for Health- Care Pesearch and Quality reported that 53% of people who had Coronary bypass…

A: From the provided information, 53% of people had coronary bypass surgery in a recent year were over…

Q: One standard for admission to Redfield College is that the student must rank in the upper quartile…

A: Given data: One standard for admission to Redfield College is that the student must rank in the…

Q: Which are considered to be measures of centi tendency?

A:

Q: A report states that the cost of repairing a hybrid vehicle is falling even while typical repairs on…

A: Given Information: Sample size (n) = 100 Sample mean (x¯) = $3,750 Sample standard deviation (s) =…

Q: A new process for producing a type of novolac resin is supposed to have a mean cycle time of 3.5…

A: Null hypothesis: µ=3.5. Alternative hypothesis: µ>3.5. Here, the sample mean, x-bar is 3.5067.…

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.