A sample of 380 customers selected from Supermarket I produced a mean satisfaction index of 7.6 with a standard deviation of 0.75. Another sample of 370 customers selected from Supermarket II produced a mean satisfaction index of 8.1 with a standard deviation of 0.59. Assume that the customer satisfaction indexes for the two supermarkets have unknown and unequal population standard deviations. .Let and  be the mean of Supermarket I and Supermarket II, respectively. Using 98% confidence level. Determine the following: a) Reliability factor b) Standard error. c) Point estimate of μ1-μ2 d) confidence interval of μ1-μ2

Q: Suppose that the quarterly sales levels among the health care information systems companies are…

A: Given that the mean of 8 million dollars and a standard deviation of 1.2 million dollars.  μ=8σ=1.2…

Q: Babies born weighing 2500 grams (about 5.5 pounds) or less are called low-birth-weight babies, and…

A: a. Given:sample mean (x̄)= 2500mean (μ)= 3449standard deviation (σ)=…

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A: From the given data ,5466  ,  = 50688191  ,  477735      ,   35Significance level , 0.10

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A: x¯1=69, s1=19, n1=38x¯2=32, s2=14, n2=37

Q: Suppose that the quarterly sales levels among health care information systems companies are…

A: Given Data: Let X represent the random variable Mean=9 Standard deviation=1.1 X~ Normal (9, 1.12)…

Q: Suppose that the quarterly sales levels among health care information systems companies are…

A: Given data,Mean μ=11sd      σ=1.2P(X<x)=20%x=?

Q: until remission of 162 days with a standard deviation of 7 days. Assume that the populations of…

A: Given that  n1=13x1=176s1=5n2=14x2=162s2=7 Pooled standard deviationsp=n1-1s12+n2-1s22n1+n2-2…

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A: From the provided information,Sample size (n) = 31Sample mean (x̄) = 21.4Sample standard deviation…

Q: Suppose babies bom after a gestation period of 32 to 35 weeks have a mean weight of 26000 grams and…

A: Babies born after a gestation period of 32 to 35 weeks have a mean weight of 2600 grams and a…

Q: The National Health Statistics Reports published in 2018 reported that a sample of 360 ten-year- old…

A: Null and alternate hypotheses: The investigator is specifically interested to test whether the mean…

Q: Suppose that the quarterly sales levels among health care information systems companies are…

A: Given :  μ = 10 σ = 1.1

Q: Suppose that the quarterly sales levels among health care information systems companies are…

A: given data normal distribution μ = 12σ = 1.2

Q: A marketing firm wants to estimate the difference in the mean amount of caffeine in two brands of…

A:

Q: The daily commuter to work for a section of interstate has a mean of 22 minutes and a standard…

A:

Q: According to the American Medical Association, the average annual of radiologists in the USA are…

A:

Q: A student at a four-year college claims that mean enrollment at four-year colleges is higher than at…

A: The following information has been provided: n1=35          n2=35x¯1=5466      x¯2=5068s1=8191…

Q: A study was conducted to determine the effectiveness of hypnotism on reducing pain. Using standard…

A: Sample 1(before hypnosis): n1=8x¯1=8.713s1=2.177 Sample 2(after hypnosis): n2=8x¯2=5.588s2=2.608

Q: Suppose babies born after a gestation period of 32 to 35 weeks have the mean weight of 2800 grams…

A: To determine which baby weights are more relative to the gestation period, for that it is needed to…

Q: Step 1 of 4: State the null and alternative hypotheses for the test. Step 2 of 4: Compute the value…

A: Here given  A medical researcher wants to compare the pulse rates of smokers and non-smokers. He…

Q: A sample of 14 commuters in Cebu showed the average of the commuting times was 33.2 minutes. If the…

A: Sample size : n=14 Sample mean : x¯=33.2 Sample standard deviation : s=8.3 Confidence level :…

Q: interested in the true mean age for Winter Foothill College students. Let X = the age of a Winter…

A: Given : Sample Size , n= 25 Sample Mean , x̄ =30.4 population standard deviation ,…

Q: The Weston Rescue Service and the Mid-Valley Ambulance Service are tested for response times. A…

A: Provided information is, the Weston Rescue Service and the Mid-Valley Ambulance Service are tested…

Q: Suppose that the quarterly sales levels among health care information systems companies are…

A: Given data,Mean μ=9 million dollarssd     σ=1.1 million dollarsP(X<x)=15%x=?

Q: The applet displays a scatterplot with the following points:…

A: The given points are (7,10), (27,35), (24,25), (8,12), (10,19), (15,22).

Q: Assume a researcher wants to compare the mean Alanine Aminotransferase (ALT) levels in two…

A: Consider µD is the mean ALT levels for individuals who drink alcohol and the µND is the mean ALT…

Q: Suppose that the quarterly sales levels among health care information systems companies are…

A: mean=8 standard deviation=1.1

Q: Suppose that the quarterly sales levels among health care information systems companies are…

A:

Q: Researchers are interested in the effect of pet companionship on depression in elderly adults. They…

A: Paired T-Test :The paired t-test gives a hypothesis examination of the difference between population…

Q: Determine the sales level (in millions of dollars) that is the cutoff between quarters that are…

A: Suppose that the quarterly sales levels among health care information systems companies are…

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A: Given data: Significance level = 0.05 Sample size: n1= 41 and n2 = 41 Claim: There is a significant…

Q: Suppose that the quarterly sales levels among health care information systems companies are…

A: Given Information: Suppose that the quarterly sales levels among health care information systems…

Q: Suppose that the quarterly sales levels among health care information systems companies are…

A: Solution

Q: Suppose that men's mean heartrate is 78.3 beats per minute (bpm), and women's mean heartrate is 73.9…

A: Given:men's mean heartrate =78.3women's mean heartrate=73.9standard deviation for both =4.7  and…

Q: Suppose that the quarterly sales levels among health care information systems companies are…

A: Given information- Population mean µ = 8 million Standard deviation σ = 1.1 million Z = -1.2816…

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Q: A random sample of 30 words from Jane Austen's Pride and Prejudice had a mean length of 4.08 letters…

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Q: he producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A: Solution: Given information: n= 45 Sample size x= 1.92 Pounds  Sample mean μ= 1.8 pounds  Population…

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: Researchers are interested in the effect of pet companionship on depression in elderly adults. They…

A:

Q: Suppose that the quarterly sales levels among health care information systems companies are…

A:

Q: Suppose that the quarterly sales levels among health care information systems coffi dollars and a…

A: Answer  Mean =12 standard deviation =1.3

Q: Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 2500 grams and…

A: Given that the mean of the gestation period of 32 to 35 weeks is 2500 and standard deviation is 800.…

Q: Q3. Estimate the mean deviation from the median of the following set of examination marks. Marks 0-9…

A: Given : Marks No. of students 0-9 3 10-19 5 20-29 10 30-39 28 40-49 31 50-59 36…