51. Netflix: A study conducted in 2015 by the technology company Rovi (now TiVo) showed that the mean time spent per day browsing the video streaming service Netflix for something to watch was 19.3 minutes. Assume the standard deviation is o = 8. Suppose a simple random sample of 100 visits taken this year has a sample mean of i = 21.5 minutes. A social scientist is interested to know whether the mean time browsing Netflix %3D has increased. a. State the appropriate null and alternate hypotheses. b. Compute the value of the test statistic. c. State a conclusion. Use the a = 0.05 level of significance.

Q: 4. Compute the test statistic and show it on your picture. The computation may be done on your…

A: we have given that sample mean =  = 21.5sample size =n =100alpha = 0.05population standard deviation…

Q: A dermatologist is interested in whether a new treatment for poison ivy would reduce symptoms more…

A: Given μ0=38, x=50 and s=10   1. State the null hypothesis: H0:μ=38   2. State the alternative…

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A:

Q: What is the standard deviation on the graph ?

A:

Q: Scores on a test have a mean of 86 and a standard deviation of 13. Jerrica has a score of 94.…

A:

Q: Assume that adults have IQ scores that are normally distributed with a mean of 99.2 and a standard…

A: Given info: IQ scores are normally distributed with a mean of μ=99.2 and a standard deviation…

Q: Suppose a gas station monitors how many bags of ice they sell along with the maximum daily…

A: Given that, Let the temperature (X) be independent variable with mean x¯=83.8959oF with a standard…

Q: The head of institutional research at a university believed that the mean age of full-time students…

A: The random variable age follows normal distribution. The population mean is 27.4 years. We have to…

Q: Suppose that a certain brand of light bulbs has a mean life of 600 hours and a standard deviation of…

A: Solution: Let X be the lifetime of a bulbs. From the given information, X follows normal…

Q: A successful basketball player has a height of 6 feet 8 ​inches, or 203 cm. Based on statistics from…

A: Consider X is a random variable defined as the height of a successful basketball player.The provided…

Q: The scores on a mathematics exam have a mean of 71and a standard deviation of 8. Find the x-value…

A: Let X denote the scores on a mathematics exam and it follows normal distribution with mean of…

Q: In a recent year, Washington State public school students taking a mathematics assessment test had a…

A: Given Information:

Q: A researcher collected data from Boston police officers and found that on average they spent 14.3…

A: From the provided information, Mean (µ) = 14.3 Standard deviation (σ) = 3.2

Q: In a recent study of 35 Grade5 students, the mean number of hours per week that they played video…

A: We know that,  Sample size (n) = 35, sample mean (x̄) = 16.6 and population standard deviation (σ) =…

Q: Which of the three brands had the smallest mean lifetime?

A: We are given a dot plot of brands and lifetimes. We need to answer the brand name with the smallest…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.1 and a standard…

A:

Q: Each year students in a local school district write a national examination. The average on this…

A: Average of a dataset is the mean value of the observations in the data and it is computed by…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 95.9  and a standard…

A: Given mean=95.9, standard deviations σ=24

Q: Consider the variable, type of birth control practiced (e.g., an IUD, condoms, none, etc). Which…

A:

Q: Find the standard error. Answer 2.8 O 16.6 O 1.96 O 0.4733 O 15.67<μ <17.53

A: Standard error=Standard deviation/sqrt(sample size)

Q: Tracking the mean age of a first-time mother is of interest to researchers and the public since it…

A: Back in 2016, the mean age of first-time mothers was 26.3 years Hypothesized mean , μ0 = 26.3 sample…

Q: Suppose that the life-span of goldfish can be modeled by the Normal Distribution with a mean of 5…

A:

Q: Suppose you organized a​ 10-kilometer race in which the times were normally distributed with a mean…

A: Let X be any selected finishing time. Here, we have to find the percentage of runners took longer…

Q: study indicates that​ 18- to​ 24- year olds spend a mean of 115 minutes watching video on their…

A:

Q: A researcher named liza wants to estimate the mean age of pilots in an airline company. The…

A: Given: σ=6.30Length of the interval=3.2

Q: A recent survey found that 61% of all adults over the age of fifty wear glasses for driving. In a…

A: Given that Given distribution is binomial. n=Random sample of 80 adult n=80 p=61% of adults over the…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

A: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

Q: Suppose the durations of human pregnancies follow a mound-shaped distribution with a mean of 266…

A:

Q: A test score of 36 has an equivalent standard score (z-score) of -2.4. If the standard deviation is…

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Q: LED lamp has a mean usage of 750 hours with standard deviation of 50 hours. If LED lamp usage is…

A: Provided information is,  A LED lamp has a mean usage of 750 hours with standard deviation of 50…

Q: Draw the normal curve. Suppose that the amount of time it takes the Bureau of Internal Revenue…

A: Solution-: Given: μ=14,σ=1.5 We want to find x such that, P[X&lt;x]=0.45

Q: A student graduated from a 4 -year college with an outstanding loan of $9563 where the average debt…

A:

Q: Assume that an intelligence test scores are distributed normallt with a mean of 100 and a standard…

A: Standard normal distribution: The standard normal distribution is a special case of normal…

Q: n what range of money for their annual salary?

A: In this, the given values are: μ=54,600 σ =10,200 According to the empirical rule, for normal…

Q: In the year 2033, katy perry is a leading traveling nurse. Katy is interested in reducing the mean…

A: Population mean, μ=8.6 Sample size, n=46 Sample mean, x¯=8.1  Sample sd, s=1.2 α=0.05

Q: The length of songs in the Big Hair playlist of a Statistics professor's mp3 player varies from song…

A: a) The probability that the next song to be played is between 3.9 and 4.85 minutes long is 0.5321.b)…

Q: Suppose that the annual household income in a small Midwestern community is normally distributed…

A: Solution: Let X be the annual household income in a small Midwestern community is normally…