A shopper in a grocery store purchases 22 items on average. A store manager believes that the mean is greater than 22. She surveyed a randomly selected group of 36 customers and found that the mean of the number of items purchased was 23.2. The population standard deviation is 3.7 items. At α = 0.05, can it be concluded that the mean is greater than 22 items?

Q: Suppose that a distribution of 400 items has mean 130 and standard deviation 5. Find the​ z-score of…

A: Given that.   X~N( μ , ?)   μ=130     , ?=5  , x=143   Z-score =( x - μ )/?

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A: Given:

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A: Given The data is as follows: Pop. mean, μ=8Sample size, n=62Sample mean, x¯=7.8Sample sd,…

Q: Use the z table to find the value k so that 40% of the scores are greater than k.

A: Normal distribution is widely used in statistics . It is very useful in modern times .

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A: From the given information, let X be the weekly per capita milk intake. Here, X follows normal…

Q: a. What is the difference between carrier's highest data speed and the mean of all 50 data speeds?…

A: Here Given  Highest Speed measured=76.6 Mbps Sample Size=50 Sample mean=x¯=18.68 Sample sd= s= 37.17…

Q: samples of n = 100 from

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Q: A statistics professor announces that 15% of the grades he gives are As. The results of the final…

A: It is given that the mean and standard deviation are 83 and 6, respectively.

Q: During rush hour, the traffic speed on a busy highway is found to have mean 42 mph and standard…

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Q: For a population with a mean of 75 and a standard deviation of 4, find the Z Score for an X Score of…

A: Given,population mean(μ)=75population standard deviation(σ)=4Raw score(X)=73

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A: Here it is given that- Total number of samples(n) = 34 Mean(x)¯ = 320 Standard deviation(δ) = 24

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A: Given that - A population of N= 23 scores has a mean of u = 5. After one score is removed, the mean…

Q: Pyramid Lake is on the Paiute Indian Reservation in Nevada. The lake is famous for cutthroat trout.…

A: Givenaverage length of trout caught in Pyramid Lake is μ = 19 inches.Sample size = 45sample mean = x…

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Q: In one town, the number of pounds of leafy greens consumed per person per year has a mean of 10…

A: (1) Standardized z-score:   The standardized z-score represents the number of standard deviations…

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Q: Consider again the birth weights of newborn babies, where the mean weight is 3290 grams and the…

A: From the provided information,Mean (µ) = 3290Standard deviation (σ) = 520X~N (3290, 520)

Q: For a sample with a mean if M=63, a score of X=54 corresponds to Z= -0.75. what is the sample…

A: Given,Mean(M)=63a raw score(X)=54Z-score=-0.75

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A: INTRODUCTION:  LARGE SAMPLE TEST  x1 be the sample mean of the sample taken from the first…

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Q: Pyramid Lake is on the Paiute Indian Reservation in Nevada. The lake is famous for cutthroat trout.…

A: Note: As per our guidelines we are supposed to answer only 3 subparts of any questions so i am…