A medical staff who knows statistics is concerned with the weights of babies. What's the minimum sample size needed to be 97% confident that the true mean is within 2.1 ounces of the sample mean? The standard deviation of the weights is known to be 7 ounces.

Q: A food critic wishes to estimate the weights of premium steaks at a five star Texas style…

A: From the provided information, Confidence level = 90% Margin of error (E) = 6 ounces Standard…

Q: A researcher wants to estimate the mean serum cholesterol level for college age women.  In a past…

A: Given, Margin of error = 3 σ = 42

Q: According to the Empirical rules rule, if there are 500 observations in a mound shaped data set the…

A: The empirical rule, also referred to as the three-sigma rule or 68-95-99.7 rule, is a statistical…

Q: The U.S. Department of Transportation provides the number of miles that residents of the 75 largest…

A:

Q: The mean for a data set is 75, the standard deviation is 4, and the z score is -0.19, what is the…

A: We have given that,  From the normal distribution with mean (mu) = 75 and standard deviation (sigma)…

Q: The American Veterinary Association claims that the annual cost of medical care for dogs averages…

A: Given  The annual cost for medical care  for dogs average    =  $100 SD             = $30 for cats…

Q: A large number of applicants for admission to graduate study in business are given an aptitude test.…

A:

Q: The standard deviation may not be greater than the mean. O True O False

A: False: standard deviations may be greater than mean  example: random variable x follow standard…

Q: A nutritionist claims that the mean tuna consumption by a person is 3.1 pounds per year. A sample…

A: Solution: Let X be the tuna consumption by a person. From the given information, n=90, x-bar=2.9 and…

Q: A nurse at a local hospital is interested in estimating the birth weight of infants. How large a…

A: Introduction: The 100 (1 – α) % confidence interval for the population mean, μ, when the population…

Q: oretta, who turns  91  this year, has heard that the mean systolic blood pressure among the elderly…

A: Given: Sample size (n)= 19 Sample mean x¯=130 Sample standard deviation (s) = 20 Hypothesized mean…

Q: A scientist has read that the mean birth weight, , of babies born at full term is 7.5 pounds. The…

A: a) Null and Alternate Hypothesis: H0: μ=7.5H1: μ>7.5 Therefore, H0: μ is equal to 7.5 H1: μ is…

Q: A researcher finds that the mean income (in dollars per week) of a sample of people who live in a…

A: Given:

Q: The lengths of a certain species of fish were found to be normally distributed. The mean length is…

A: Given Information :  The lengths of a certain species of fish were found to be normally distributed.…

Q: A researcher wishes to estimate within $200 the mean amount of money a county spends on road repairs…

A: When the population standard deviation is known, then the margin of error is calculated by ME=z*σn,…

Q: USA Today reports that the average expenditure on Valentine's Day was expected to be $100.89. De…

A:

Q: A small pilot study was conducted to compare cholesterol levels in individuals before and after a…

A: Preliminary calculation:Using the EXCEL formula “=NORM.S.INV(1– (0.05/2))”, the z-value for 95%…

Q: A university dean of students wishes to estimate the average number of hours students wish to spend…

A: The formula for the sample size is as follows:

Q: The population standard deviation for the height of high school basketball players is three inches.…

A: Solution: 6. From the given information, confidence level is 0.95, σ=3 inches and E=1.

Q: In a factory producing glasses, the weights of glasses are known to have a mean of 160 grams. It is…

A: By looking at a Z table we can conclude that Q1 and Q3 are each .6745 standard deviations from the…

Q: A medical statistician wants to estimate the average weight loss of people who are on a new diet…

A: Given,standard deviation(σ)=8margin of error(E)=2α=1-0.94=0.06α2=0.03Z0.03=1.8808       (from…

Q: he History test had a national mean of µ = 52 and a standard deviation of  σ= 9. How much sampling…

A: Given data, µ = 52  σ= 9 n=27 sampling error=?

Q: 21 year old men rates at rest are normally distributed with a mean of 70 beats per minute, and a…

A: Given that   21 year old men rates at rest are normally distributed Mean (μ)=70 beats per minute…

Q: In the general population, the mean IQ is 100 with a standard deviation of 15. Dr. Robbins wants to…

A: From the provided information, Population mean (µ) = 100 Population standard deviation (σ) = 15

Q: A nurse at a local hospital is interested in estimating the birth weight of infants. How large a…

A:

Q: A consultant wants to estimate the average income of all the baby boomers in NYC. From prior…

A:

Q: t is known that the average time required to complete a test exam is 80 minutes and the standard…

A: Given Information: Mean μ=80 min Standard deviation σ=10 min. To find how many minutes should the…

Q: nurse at a local hospital is interested in estimating the birth weight of infants.  How large a…

A: s = 7 z-critical value = 2.576 margin of error = 2

Q: It is given that a vending machine dispenses a mean of 7.6 ounces with a standard deviation of 0.4…

A: Given: Mean = 7.6  Standard deviation =  0.4 oz

Q: Is the fat content per serving of a peanut butter significantly different from what the manufacturer…

A: We have given that  Population mean = 15 Sample mean = 15.6 Sample standard deviation = 1.8 Sample…

Q: The U.S. Department of Transportation provides the number of miles that residents of the 75 largest…

A: confidence interval is a part of interval estimation. Interval estimation gives the value of the…

Q: me that the heights of women are normally distributed with a mean of 62.9 inches and a standard…

A: To calculate the 75th percentile of a normal distribution, we used the formula as: X=μ+Zσ Where 'X'…

Q: The U.S. Department of Transportation provides the number of miles that residents of the 75 largest…

A:

Q: Do men take less time than women to get out of bed in the morning? The 42 men observed averaged 7.6…

A: Given : Men  Sample size = nm = 42 Mean = xm = 7.6 Standard deviation = sm = 2.2 Women  Sample size…

Q: 3.5 inches, how tall does a woman have to be to have a height in the 90th percentile? Round off to 1…

A: Given : Population Mean,μ = 65.0 Population Standard Deviation,σ = 3.5

Q: What is the best approximation of the standard deviation ofthe measures -4, -3.0, 8, and 9?

A: Solution: Let X be the measure. The given data is –4, –3, 8 and 9.

Q: A medical statistician wants to estimate the average weight loss of people who are on a new diet…

A: Solution: Given information: σ= 10  Population standard deviation E= 2 Margin of error C= 0.9=90%…

Q: The heights of adult men in America are normally distributed, with a mean of 69.3 inches and a…

A:

Q: A medical statistician wants to estimate the average weight loss of people who are on a new diet…

A: Given Data: ME=4/2=2 σ=8   z-value corresponding to 97% of CI=2.17

Q: A medical statistician wants to estimate the average weight loss of people who are on a new diet…

A:

Q: A Physics test has a mean of 150 and a standard deviation of 12.  A Geography test has a mean of 46…

A: Solution: Let X be the physics test and Y be the geography test. From the given information, X has…

Q: Loretta, who turns 91 this year, has heard that the mean systolic blood pressure among the elderly…

A: (a) The null and alternative hypothesis is; Ho: μ=120H1: μ>120 (b) Here we will be using…

Q: A quantitative data set has size 60. At least how many observations lie within three standard…

A:

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: The empirical rule states that the percentage of observations in a data set (provided that the data…

A: Empirical Rule: The percentage of values lies between one standard deviation from the mean is 68%.…

Q: on an exam, Tom scores 12 points above the mean and has a z-score of z=+2.00. the standard deviation…

A: It is given that the difference between mean and raw score is 12 and the z score is 2.

Q: The mear was 80 and the Standard deviation was 4, Kawhi scored 5, 8o his z-Score was more than one…

A:

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: for a population with a standard deviation of 8 and mean of 40, draw a bell shaped curve, marking…

A: Given data  Mean = 40 and standard deviation= 8

Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.