A workout coach believes that walking every day can produce the same health benefits as jogging. Ten volunteers are paired based on significant characteristics, and half of the group is asked to walk every day and half of the group is asked to jog every day.  The amounts of weight lost (in pounds) over a 30-day period are recorded in the following table. Construct a 95% confidence interval for the true mean difference between the amount of weight lost by jogging and the amount of weight lost by walking. Assume that the population distribution of the paired differences is approximately normal. Round to one decimal place

Q: recent year, a sample of the South American Redeye Piranha was collected by fishermen on a…

A: We have given that  Sample size n =60 Sample mean =12.88 99%confidence interval. (12.09,13.67)

Q: We have developed a new drug used to reduce fever and want to test its efficacy. Ten ER patients who…

A: First temperature : mean = 101.97 variance = 1.09 Second temperature : mean = 90.14 variance =…

Q: As part of the Pew Internet and American Life Project,, researchers conducted two surveys in late…

A: Given: n1= 800 ,x1= 584 n2= 2253 ,x2= 1059 At 95.0 % confidence level , z score= 1.96 Need to find…

Q: When Mendel conducted his famous genetics experiment with peas, one sample of offspring consisted of…

A: Obtain the 95% confidence interval estimate of the percentage of yellow peas. The 95% confidence…

Q: Controls 2.4 0.0 0.9 -0.2 1.0 1.7 2.9 -0.6 1.1 -0.1 0.3 1.2 -1.6 -0.1 -1.5 0.7 -0.4 2.2 -0.4 -0.4…

A: 1) The stem and leaf plot is Control   Breast-feeders   -8 3   -7 8,0   -6 8,8,5,5,2   -5…

Q: Insurance companies are interested in knowing the population percent of drivers who always buckle up…

A: It is given that, x is 311 and n is 400.

Q: A pharmaceutical company is running tests to see how well its new drug lowers cholesterol. Twelve…

A: The objective of this question is to construct a 99% confidence interval for the true mean…

Q: A car repair business randomly selects receipts for parts purchased on 16 different jobs. The mean…

A: given data, n=16x¯=31.32s=30.42CI=0.95α=1-0.95=0.05df=n-1=16-1=15we  have to construct the 95%…

Q: Lindsey selected a random sample of 25 tomatoes at the farmer's market. The 95% confidence interval…

A: When Lindsey selected a random sample of 25 tomatoes at the farmer's market, she was aiming to…

Q: A workout coach believes that walking every day can produce the same health benefits as jogging. Ten…

A: Obtain the 90% confidence interval for the true mean difference between the amount of weight lost…

Q: A technician randomly sampled repair logs for computers at a university. He wanted to find out how…

A: It is given that the proportion of computers that were repaired more than three times in the last…

Q: The quality-control manager of a chemical company randomly sampled twenty 100-pound bags of…

A: It is given that the sample variance is 6.62 and the sample size is 20.

Q: sample of 97 psychology graduates found an average salary of $71 K/year. Assume ?=$14 K/year. Find…

A: Given Z score 90% confidence interval=1.645 Sigma=14 n=97

Q: A sample of 500 nursing applicants included 80 men.  Determine the 95% confidence interval for the…

A:

Q: A poll of 827 students at Alpha state college found that 61% of those polled preferred a quarter…

A: It is given that the proportion of the students who preferred a quarter system to a trimester…

Q: Find the critical value zc that corresponds to a 98% confidence level

A:

Q: To study the perceptions of waiting time, a researcher conducted a survey of 100 prospective…

A: The provided information  x¯=5.2σ=1.2n=100α=0.10The critical value is zc=1.64  (from statistical…

Q: In a random sample of 42 Pa high schools it is found that the average number of students is 279.…

A: Given: n=42, x=279 and σ2=206. The value of z at 93% confidence level is 1.81.

Q: How much more sensitive to contrast are athletes with eye grease than without eye grease? Give a 95%…

A:

Q: A pharmaceutical company is running tests to see how well its new drug lowers cholesterol. Eleven…

A: From the provided information, Sample size (n) = 11 Confidence level = 95%

Q: A market researched for a consumer electronics company wants to study the television viewing habits…

A: Given: n=40x¯=15.3S=3.8 Degrees of freedom: df=n-1=40-1=39 The critical-value is obtained by using…

Q: mong 1815 randomly selected high school students surveyed by the Centers for Diseases Control, 300…

A: Given : Total number of high school students = 1815 Number of students said they were current…

Q: andom sample of 1200 high school freshmen was taken and it was found that 559 of them were reading…

A: The population proportion (p) will be proportion of high school freshman who reads at or above their…

Q: According to a recent study only 34% of adults in the United States could name all three branches of…

A: Given data, p=34%=0.34 n=1750 z-value at 95% confidence is Zc=1.96

Q: Stanford University conducted a study of whether running is healthy for men and women over age 5050.…

A: The random variable percentage of people over 50 follows binomial distribution. The sample…

Q: A survey of credit card holders revealed that Americans carried an average credit card balance of…

A: M1=$3900M2=$3300n1=400n2=450σ1=$880σ2=$810

Q: A random survey of 36 airline passengers indicates that twelve have never flown before. Find a 95%…

A: We have given that,  Sample size (n) = 36 and favorable cases         (X) = 12 Then,  We Will find…

Q: Find the critical value zc that corresponds to an 80% confidence level.

A: Given : α=1-0.80=0.20We want to find,Critical value,Zc=?

Q: company manufactures a certain over-the-counter drug. The company samples 80 pills and finds that…

A: We have given that  Sample size n = 80 Sample mean = 325.5 Standard deviation s=10.3 90%confidence…

Q: Find a 99% confidence interval for the mean of weights of Siamese cats if the population standard…

A: We have given that Sample mean (x̄) = 11.8, population standard deviation (σ) = 2.1 and sample size…

Q: Report the​ 95% confidence interval for the percentage of all young people who earned a high school…

A: From the given information, p-hat value is 0.86 and the sample size n is 1200.

Q: A simple random sample of 1000 people age 18 or over is taken in a large town. It turns out that 189…

A: The objective of this question is to calculate a 95% confidence interval for the percentage of…

Q: Out of a survey of 900 adults, 567 said that teenagers were more dangerous drivers than senior…

A: Givensample size(n)=900No.of adults said that teenagers were more dangerous divers(x)=567sample…

Q: A scientist conducts an experiement with flowers, one sample of flowers consisted of 278 red dahilas…

A: Given that  Sample size n =278 Favorable cases x =108 Sample proportion p^=x/n  =108/278 =0.3885

Q: In a random sample of 250 students who enrolled in Science, 150 took notes during classes. Find an…

A: Given that n=250,x =150,alpha =0.05 Find an approximate 95% confidence interval for the population…

Q: A Gallup poll of 1487 adults showed that 43% of the respondents have Facebook pages.  Construct a…

A: Confidence Interval: In statistics, we can say a range of values of the specified population…

Q: We have developed a new drug used to reduce fever and want to test its efficacy. Ten ER patients who…

A: Given Information: Ten ER patients who are running a fever agree to take the new drug instead of the…

Q: Explain what would happen to the length of the interval if the confidence level were decreased to…

A: Here Given  Sample size=n=60 Sample mean=x¯=12.88 And From Normal table Critical values for  95 C.I…

Q: A marketing study with a random sample of 400 results in 160 subjects reacting positively to the…

A:

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.