research team is investigating the standard deviation of the cost of a​ 30-day supply of a certain heart medication. A pharmaceutical company thinks that the standard deviation of the cost is less than $22. You want to support this claim. How would you write the null and alternative​ hypotheses? H0​: ▼   sigma equals 22σ=22 sigma greater than 22σ>22 sigma not equals 22σ≠22 sigma less than 22σ<22 sigma greater than or equals 22σ≥22 sigma less than or equals 22

Q: The director of research and development is testing a new medicine. She wants to know if there is…

A:

Q: Оиestions 12-13. A normal population has mean µ and standard deviation 12. The hypotheses to be…

A: 12. N(μ , σ = 12) H0 : μ = 40 vs H1 : μ ≠ 40 .

Q: Are you smarter than a second-grader? A random sample of 58 second-graders in a certain school…

A:

Q: Co 1. The average age of attendees at an amusement park is 45.8 years old. 50 randomly selected…

A:

Q: You collect a random sample of 100 children and compute X¯X¯ = 47.5 inches, the average height in…

A: 0.6363636363636364

Q: Are you smarter than a second-grader? A random sample of 58 second-graders in a certain school…

A:

Q: Weights of adults are normally distributed. A SRS of 26 adults found a mean weight of 169.1 pounds…

A: Hypothesis testing is conducted for the parameters of the population like population mean,…

Q: A nutritionist claims that the mean tuna consumption by a person is 3.5 pounds per year. A sample of…

A:

Q: 1. Which of the following is the correct symbol for hypothesized proportion? А. Ро С. Нр В. р D. Ho…

A: As per our guidelines we are supposed to answer only one question and 3 sub-parts of any question.…

Q: on average, than the mean score  593 . A random sample of  50  students completed the course, and…

A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are…

Q: The scores on a standardized mathematics test for 8th grade children in New York State from a normal…

A: Solution: Let X be the score on a standardized mathematics test for 8th grade children in New york.…

Q: Many people believe that the average number of Facebook friends is 145. The population standard…

A: Sample mean = 154 Population mean = 145 std dev = 36.1 α= 0.10 Claim: the mean number of friends is…

Q: The scores on the 2020 ACT were approximately normal, with a population mean of μ = 22, and a…

A:

Q: In 2015, the average iceberg weighed 20 million tons. A random sample of 100 icebergs last year had…

A: From the provided information,Standard deviation (s) = 5.7Sample mean (x̄) = 19Sample size (n) =…

Q: A survey using a sample size of 11 reveals that the average size of dairy farms in Simcoe County is…

A: t-test is a parametric test which is used to compare the mean of one or two samples. It is a small…

Q: The average earnings per share (EPS) of 36 banks is $3.2 and the standard deviation is $0.84. At…

A: Given: Sample size (n) = 36 Sample mean  x¯=3.2 Sample standard deviation (s) = 0.84     α=0.05

Q: The current electric Tesla Model S can travel an average of 300 miles on a single charge, μ equals…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: Previously, an organization reported that teenagers spent an average of 4.5 hours per week, on…

A:

Q: The director of research and development is testing a new drug. She wants to know if there is…

A: Given : sample size, n =62 sample mean, x̄ =392 population standard deviation,σ=18…

Q: The average salary in this city is $46,400. Is the average more for single people? 54 randomly…

A: Given : sample size, n = 54 sample mean, x̄ = 48011.0 sample standard deviation,s=…

Q: Are you smarter than a second-grader? A random sample of  60  second-graders in a certain school…

A: State the hypotheses.

Q: 1. A professor has been teaching statistics for many years. His records show that the overall mean…

A: Given: The sample number of students is n=25. The sample mean record is x¯=87. The standard…

Q: A research study investigated differences between male and female students. Based on the study…

A: From the provided information, Population mean for the GPA of male students (µ) = 3.5 Population…

Q: is there enough evidence to support the​ administrator's claim

A: Given that  Sample size(n)= 76 Sample mean (x¯) = 283 Population standard deviation(σ) = 31 Level of…

Q: A company claims that the mean weight of the produced gasket is exactly 60 grams with a standard…

A:

Q: A random sample of 200 observations from a quantitative population produced a sample mean of 26 and…

A:

Q: An Independent consumer group published its finding that the lifetimes of electric bulbs…

A: We have given the following information about the hypothesis  Mean = 600 Standard deviation =120

Q: A researcher is to perform a hypothesis test for a single population mean with null and alternative…

A: The random variable X follows normal distribution. The population mean is 2500. We have to test…

Q: Suppose we know that the mean score on this test for the general population (based on a very large…

A: Here,  Mean (μ) = 55 S.D (σ) = 10

Q: Suppose you have the following null and alternative hypotheses: H0 : μ = 8.3 and H1 : μ ≠ 8.3. You…

A: We have to find p value.

Q: State the null and the alternative hypothesis A principal at a certain school claims that the…

A: Since you have asked multiple questions, we will solve first question for you. If you want any…

Q: On average, Americans have lived in 2 places by the time they are 18 years old. Is this average more…

A: Given information- Population mean, μ = 2 places Sample size, n = 42 Sample mean, x-bar = 2.28…

Q: Many people believe that the average number of Facebook friends is 120. The population standard…

A: Given  Sample size n=47, sample mean x̄=145, standard deviations σ=39.2, level of significance…

Q: A one sample, two-tailed test of hypothesis about the population mean of a certain population is…

A: Decision rule for two tailed test is given below: if z&lt;-zα2 or z&gt;zα2 , then reject the null…

Q: Claim: The mean systolic blood pressure of all healthy adults is less than than 125 mm Hg. Sample…

A: The sample size is 258. The mean systolic blood pressure level is 124.72. The standard deviation…

Q: mple random sample of size n = 40 is drawn from a population. The sample mean is found to be 103.6,…

A: Given that  Random sample size (n)= 40 Sample mean (x¯) = 103.6 Sample standard deviation (s) = 21.7…

Q: Cerebral blood flow (CBF) in the brains of healthy people is normally distributed with a mean of 73.…

A:

Q: 2. Perform a hypothesis test where the null hypothesis is that the u - 6.9. A random sample of 16…

A: NOTE: As per the guidelines, we are supposed to solve the first three, so I am answering question 4,…

Q: How can we answer questions 14 and 15?

A: Approach to solving the question:  It ensures that our sample is representative of the population…

Q: I. A study reports that teenagers spend 27 hours a week online (www.telegraph.co.uk). A researcher…

A: T distribution for single mean.

Q: Your medical research team is investigating the standard deviation of the cost of a​ 30-day supply…

A: Given, Your medical research team is investigating the standard deviation of the cost of a​ 30-day…

Q: (A) A random sample of 51 adult coyotes in a region of northern Minnesota showed the average age to…

A:

Q: A random sample of 77 eighth grade students scores on a national assessment has a mean score of…

A: From the provided information, Sample size (n) = 77 Sample mean (x̄) = 289 Population standard…

Q: ficance level to 5%, should she reject her hypothesis? (a) What is Alice’s null hypothesis? What…

A: Since, the question has more than 3 parts. As per the guidelines I am obliged to answer first three…