The effect of a medication can be evaluated by how many days the patient recovered. 51 patients are randomly selected and standard deviation of recovery period is 15.7. Do the data support the claim that the standard deviation of current is less than 20 days? Explain and comment with a=0.05 Yanıt:

Q: The heights of adult men in America are normally distributed, with a mean of 69.7 inches and a…

A:

Q: an exam score has a mean of 506 and a standard deviation of 100. What exam score corresponds to a…

A: μ  = 506 , σ = 100  Z~ N(0,1)

Q: Assume that the time the student stays in school is normally distrībuted with a mean of 5 hours and…

A:

Q: A random sample of 121 bottles of cologne showed an average content of 4 ounces. It is known that…

A: Solution-: Given:  In this problem, which type of quantity does the 4 ounces refer to?

Q: Suppose the exam average in a class is 82% with a standard deviation of 6. What proportion of…

A:

Q: In another company, every worker received a 5% raise. How does this affect the mean salary? The…

A: Every worker received a 5%. The mean defines that the center or average of the data and it is…

Q: The life of a battery is normally distributed with mean 70 hours with a standard deviation of 10…

A: Given, μ = 70 σ = 10 Z = X-μσ

Q: The cholesterol levels of an adult can be described by a normal model with a mean of 188​mg/dL and a…

A: Obtain the percent of adults expect to have cholesterol levels over 200mg/dL. The percent of adults…

Q: A data set has a mean of 300 and a standard deviation of 40. What value would have a z-score of z =…

A: z-score of z = - 2 is -7.55 Reason: z-score of z = - 2=-2-meanstandard deviation=-2-30040=-7.55

Q: The effect of a medication can be evaluated by how many days the patient recovered. 10 patients are…

A: Test for Standard deviation: The χ2 Chi-Square test is used to test the significance difference…

Q: Steel rods are manufactured with a mean length of 25 centimeters (cm). Because of the variability in…

A: Given, Steel rod length are normally distributed with mean 25 cm and standard deviation 0.07.

Q: The time taken to boil a kettle is normally  distributed with a mean of 94 seconds and  a standard…

A: The provided information is  µ=94 σ=6 P(-a<X<a)=0.40…

Q: The lifetime of light produced by a company is normally distributed with standard deviation of 80…

A: Let X : Lifetime of light produced by a company is normally distributed with  Standard deviation (σ)…

Q: The mean gas mileage for a hybrid car is 57 miles per gallon. Suppose that the gasoline mileage is…

A:

Q: The mean weight of newborn Golden Retriever Puppies is 15.2 ounces, with a standard deviation of 1.3…

A: Mean = 15.2 standarsd derivation = 1.3 x=14.4 p(x)=(x-mean)/s.d =(14.4-15.2)/1.3 = -0.8/1.3

Q: lies

A: Let X be the random variable such that the  daily water usage per person in Quezon City. The daily…

Q: Do men take less time than women to get out of bed in the morning? The 57 men observed averaged 4.7…

A:

Q: The number of ounces of water a person drinks per day is normally distributed with a standard…

A:

Q: The mean life of a battery is 55 hours with a standard deviation of 6 hours. The manufacturer…

A:

Q: . A biologist is interested in studying the effect of vitamin supplements on deer mouse body length.…

A:

Q: The heights of adult men in America are normally distributed, with a mean of 69.1 inches and a…

A:

Q: A batch of tablets has mean drug content of 150 mg with standard deviation of 5 mg. 80% of the…

A: Critical value: Using Excel formula "=NORM.S.INV(1-(0.2/2))", the critical value for which 10% above…

Q: in city, the average 20- to 29-year old man is 69.4 inches tall, with a standard deviation of 3.0…

A: Let X be hight of Man from normal distribution with mean (μ) = 69.4, standard deviation (σ) = 3.0…

Q: an exam score has a mean of 506 and a standard deviation of 100. What exam score corresponds to a…

A:

Q: A manufacturer claims that the mean lifetime of its lithium batteries is 1400 hours. A homeowner…

A: Given, Claim: A manufacturer claims that the mean lifetime pf its lithium batteries is 1400 hours.…

Q: A survey by the National Retail Federation found that women spend on average $146.21 for Christmas.…

A: Given: μ=$146.21, σ=$29.44

Q: During 1 week, an overnight delivery company found that the weights of its parcels were normally…

A: A normal distribution is called a standard distribution if; 1. 68% of the values of the random…

Q: . A hat company found women had a mean head circumference of 57.46 cm and a standard deviation of…

A: According to empirical rule 95% of the data lie within 2 standard deviation and approximately 99.7%…

Q: The carapace length of an adult is normally distributed with a mean of 17.55 mm and a standard…

A:

Q: the average height of grade 10 students is 148 cm. a sample of 250 students had an average heigh of…

A:

Q: . The average number of calories in a bar is 250 and has a standard deviation of 15. The number of…

A: As per our guidelines we are supposed to answer only one question per post so I am solving first…

Q: A livestock company reports that the mean weight of a group of young steers is 1150 pounds with a…

A: μ=1150σ=87  =P1050<x<1250

Q: The width of an A4 piece of paper is  normally distributed with a mean of 210  mm and a standard…

A: The width of an A4 piece of paper is normally distributed with a mean of 210 mm and a standard…

Q: The score on a test have a mean of 100 and standard deviation of 15. If a personnel manager wishes…

A: From the given information we find the cut off score.

Q: Suppose that a certain brand of water filter has a mean life of 600 gallons and a standard deviation…

A: Mean = 600 Standard deviation = 53

Q: The mean life of a battery is 50 hours with a standard deviation of 6 hours. The manufacturer…

A:

Q: The average on quiz score is 4 with a standard deviation of only 0.385. What are the chances that…

A: Given that mean=4 and standard deviation= 0.385 Let, X= quiz score  X follows normal distribution…

Q: The average rainfall in a certain area is 24.5 inches per year, with a standard deviation of 3…

A:

Q: For a medical study, a researcher wishes to select people in thr middle 75% of the population based…

A: Introduction: Definition: Z-score A Z-score is a numerical measurement that describes a value's…

Q: A biologist found the wingspans of a group of monary butterflies to be normally distributed with a…

A: As we are entitled to solve one question at a time I will answer 2nd one as some information is…

Q: The weight of newborn babies is normally distributed, with a mean of 3.5 kilograms and a standard…

A:

Q: he mean of the waiting times in an emergency room is 80.2 minutes with a standard deviation of 10.5…

A: Emergency waiting time Mean(X) = 80.2 sigma(X) = 10.5   Discharge Time Mean(Y) = 120.6 sigma(Y) =…

Q: Suppose the exam average in a class is 55% with a standard deviation of 4. What proportion of…

A: The random variable score follows normal distribution. The population mean is 55.         The…

Q: The daily water usage per person in Davao City is normally distributed with a mean of 18 gallons and…

A: Given information: Let X be the random variable denoting the daily water usage per person in Davao…

Q: The average weight of a group of students is 68 kg with a standard deviation of 8 kg. If the z-score…

A: Givenmean(μ)=68standard deviation(σ)=8z-score=0.5

Q: A nutritionist claims that the mean tuna consumption by a person is 3.6 pounds per year. A sample…

A: Given that  Claim :  Mean tuna consumption by a person is 3.6 pounds per year Sample size (n) = 90…

Q: It has been reported that the variance of the speeds of drivers Turnpike near Somerset, PA is 64 for…

A: From the provided information, Sample size (n) = 50 Sample standard deviation (s) = 10.5 Level of…

Q: A nutritionist claims that the mean tuna consumption by a person is 3.5 pounds per year. A sample of…

A: (a) Let μ is defined as the population mean tuna consumption by a person. The claim of the test is…

Q: A researcher claims that the amounts of acetaminophen in a certain brand of cold tablets have a…

A: Hypothesis: Hypothesis is an assumption about the parameter of the population which will be made…

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.