A recent survey of 8 social networking sites has a mean of 13.1 million visitors for a specific month with the standard deviation was 4.1 million. 1. Find the value of t with a 95% confidence level. 2. Find the 95% confidence interval of the true mean. Kindly answer both questions PLEASE. I'll give rate. Thanks Choices are attached (choices are for both questions).

Q: The length of a Colorado brook trout is normally distributed. What is the probability that a brook…

A: We are given that, the length of a Colorado brook trout is normally distributedWe are asked to…

Q: Raul received a score of 73 on a history test for which the class mean was 70 with a standard…

A: Here we need to find the z score and for that, we have to use the formula z = Value-meanStandard…

Q: Which is true of the data shown in the histogram? Mark ALL that apply. We should use the mean and…

A: Which is true of the data shown in the histogram? We should use the mean and standard deviation to…

Q: The mean annual tuition and fees for a sample of 13private colleges was $33,300 with a standard…

A: Given: n= 13.0 ,x̄= 33300.0 ,s= 4500.0 µ= 35900.0 ,degree of freedom= 12.0

Q: A psychology exam has 300 questions with each question worth 1 point. Assume that the distribution…

A: It is given that mean score is μ=165 and Standard deviation is σ=30 for a normal distribution of…

Q: company produces steel rods. The lengths of the steel rods are normally distributed with a mean of…

A:

Q: A person scores 81 on a test of verbal ability and 6.4 on a test of quantitative ability. for the…

A: Consider X is a random variable defined as the score of the verbal ability test of a person.Consider…

Q: A class of 30 62.171 students took a quiz worth 50 points. The standard deviation of the scores was…

A: Standard deviation of sample is given by

Q: Use the range rule of thumb to identify the values that are significantly low, the values that are…

A:

Q: Greg is in his first semester at a university and is taking a calculus course with a large…

A:

Q: A student scored 51 on a math achievement test for which the mean was 36 and the standard deviation…

A: From given data we have  Mean = 36 standard deviation = 6 X=51

Q: The first statistics exam had a mean of 73 and a standard deviation of 15 ​points; the second had a…

A: The objective of the question is to compare the performance of Anna and Megan on two different exams…

Q: How do I answer this question? Noise levels at various area urban hospitals were measured in…

A: We have given that,  Sample size (n) = 84 Sample mean (x-bar) = 61.2 Sample standard deviation (s) =…

Q: Use the range rule of thumb to identify the values that are significantly low, the values that are…

A:

Q: 1) Z-SCORE. Which has a better relative position: a score of 75 on a statistics test with a mean of…

A: HI, we are supposed to answer one question at a time. Since you have not mentioned which question to…

Q: Noise levels at various area urban hospitals were measured in decibels. The mean of the noise levels…

A: Interval estimation is proposed as an estimate of the unknown parameter. Confidence interval is also…

Q: The mean score on the ACT test was 23.7 and the standard deviation was 5.8. The distributions of…

A: Given: Mean = μ = 23.7 Standard deviation = σ = 5.8

Q: Fresh Catch Restaurants serves seafood. One of their best-sellers is lobster. The chef determined…

A:

Q: Two students, Will and Tom, want to find out who scored relatively higher on a science midterm. The…

A: We have to find z score and Which student scored higher on the midterm when compared to their…

Q: Suppose a variable is normally distributed. What percentage of scores fall between one standard…

A:

Q: Tom runs a large animal shelter. At Tom's shelter, the length of stay for puppies has a mean of 76…

A: Given,mean(μ)=76standard deviation(σ)=13and X=41

Q: Pearson revises books each semester and the mean number of pages for 2010 is 568 with a standard…

A: Let, X= number of pages  Given that X follows normal distribution with mean= 568 and standard…

Q: Suppose that you take an exam with 400 possible points and are told that the mean score is 280 and…

A: The empirical rule for variables is as follows: 68% of all possible observations lie within one…

Q: Scores on a test have a mean of 6 and a standard deviation of 9. Michelle has a score of 57. Convert…

A:

Q: Three potential employees took an aptitude test. Each person took a different version of the test.…

A: The z-score will be used to answer the given question. The formula for the z-score is z=x-μσ that…

Q: What raw score does he need to get the certificate

A: Given that Mean = 83 And SD = 3.2

Q: The first statistics exam had a mean of 66 and a standard deviation of 13 ​points; the second had a…

A: The objective of this question is to calculate the z-scores for Anna and Megan on both exams and…

Q: At a tennis tournament a statistician keeps track of every serve.  The statistician reported that…

A: GivenMean(μ)=100standard deviation(σ)=9

Q: Consider a value to be significantly low if its z score less than or equal to −2 or consider a value…

A: The mean test score  to assess readiness for college = 20.8 Standard deviation = 4.5   Given z…

Q: One of the tallest living men has a height of 250 cm. One of the tallest living women is 232 cm…

A: Given that, Xmen=250 cm     μ=176 cm     σ=7 cm The z-score for men is,

Q: Every observation in a data set is multiplied by a constant k. What best describes the effect on…

A: Given : Every observation in a data set is multiplied by a constant k. Let assume observations are :…

Q: The mean score on the ACT test was 21.5 and the standard deviation was 5.0. The mean score on the…

A: ACT score μ1 = 21.5σ1 = 5.0x1 = 26SAT score μ2 = 515σ2 = 100x2 = 605 which score will relatively…

Q: 3.) If you choose 25 companies, what is the probability that they a 0.5 percent? A.) 0.0162…

A:

Q: A machine used to fill gallon-sized paint cans is regulated so that the amount of paint dispensed…

A: Given that mu = 138 s.d = 0.4

Q: Your Stat teacher tells you that your test score was at the 2nd quartile for the class. Which is…

A: Quartile 2 is also the median

Q: Assume that adults have IQ scores that are normally distributed with a mean of 105   and a standard…

A: It is given that the mean and standard deviation are 105 and 15, respectively.

Q: Let's look at the relationship between hour Price (in thousands of dollars) and house Size (In…

A: Note: Hi! Thank you for the question. As you have posted multiple sub-parts, according to our…

Q: Entry to a cerain university is determined by a national test. The scores on this test are normally…

A:

Q: What test scores are significantly low? Select the correct answer below and fill in the answer…

A: It is given that Mean = 22.6 And SD = 4.9

Q: 1. Estimate the population mean of the weekly allowance of DPC students at 99% confidence level…

A: Confidence level = 99% mean allowance of 169 samples is 1430 with a standard deviation of 660. Here…

Q: The distribution of the scores on a standardized exam is approximately normal with mean 400 and…

A: The two values of Z that will contain 50% of scores lie are obtained as shown below:From the…

Q: unts how many meteors she se

A:

Q: The first statistics exam had a mean of 73 and a standard deviation of 15 ​points; the second had a…

A: From the provided information,Anna scored a 82 on both tests. Megan scored 92 on the first exam and…

Q: Beth scored 88 on a nutrition test.  The class mean was 81 and the standard deviation was 3.2.  What…

A: Mean = μ = 81 Standard deviation = s = 3.2 Where, X= 88

Q: Cereals sodium values have a mean of 167 and a standard deviation of 77.3. Find the z-score for the…

A: