Which of the following Python methods is used to perfo population mean when the population standard deviation is unknown? Select one. ztest(dataframe, null hypothesis value) ttest 1samp(dataframe, null hypothesis value) prop_1samp_hypothesistest(dataframe, ttest(dataframe, null hypothesis value) n, alternative hypothesis value)
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- The dean of a major university claims that the mean number of hours students study at her university (per day) is at most 5.6 hours. If a hypothesis test is performed, how should a decision that fails to reject the null hypothesis be interpreted?On Excel spreadsheet, find the results of the hypothesis test for the equality of the mean production levels between the two locations Tampa, Florida, and Columbus, Ohio. The current production goals for the monthly production level of the cases are a mean of at least 1,000 units per month and a standard deviation of less than 100 units per month. Are the company goals being met for the cases produced at the Tampa, Florida location? Are the company goals being met for the cases produced at the Columbus, Ohio location? Are the mean production levels the same between the Tampa, Florida and Columbus, Ohio locations?In a PH modeling agency, a researcher wishes to see if the average height of female models is really less than 67 inches, as the chief claims. A sample of 32 models has an average height of 66.3 inches. The standard deviation of the sample is 1.9 inches. At a = 0.05, is the average height of the models really less than 67 inches? Use the P-value hypothesis-testing method. State the hypotheses and identify the claim. 4. Type of Test: - tailed test (Choose the letter of the best answer) A. Right B. Left C. Two Compute the test value. 5. Test Value = (Type the exact answer) Find the P-value 6. P-value: (Type the exact answer)
- A sample of 100 flounder have a sample mean weight of 21.5 grams. Scientists wish to perform a hypothesis test to determine if the mean weight differs from 20 grams. State the appropriate null and alternative hypotheses.A group of transfer bound students wondered if they will spend the same mean amount on texts and supplies each year at their four-year university as they have at their community college. They conducted a random survey of 54 students at their community college and 66 students at their local four-year university. The sample means were $947 and $1,011, respectively. The population standard deviations are known to be $254 and $87, respectively. Conduct a hypothesis test to determine if the means are statistically the same, using the same format as problem 2, Please only answer g-h. I submitted this once before and recieved answers for a-f. Thank you! a. H0: _______ b. Ha: _______ c. In words, clearly state what your random variable X represents. 1 − X 2 d. State the distribution to use for the test. e. What is the test statistic? f. What is the p-value? In one to two complete sentences, explain what the p-value means for this problem. g. Use the previous information to sketch a picture of…A group of transfer bound students wondered if they will spend the same mean amount on texts and supplies each year at their four-year university as they have at their community college. They conducted a random survey of 54 students at their community college and 66 students at their local four-year university. The sample means were $947 and $1,011, respectively. The population standard deviations are known to be $254 and $87, respectively. Conduct a hypothesis test to determine if the means are statistically the same, using the same format as problem 2, a. H0: _______ b. Ha: _______ c. In words, clearly state what your random variable X represents. 1 − X 2 d. State the distribution to use for the test. e. What is the test statistic? f. What is the p-value? In one to two complete sentences, explain what the p-value means for this problem. g. Use the previous information to sketch a picture of this situation. CLEARLY label and scale the horizontal axis and shade the region(s)…
- The board of a major credit card company requires that the mean wait time for customer service calls is at most 3.00 minutes. To make sure that the mean wait time is not exceeding the requirement, an assignment manager tracks the wait times of 45 randomly selected calls. The mean wait time was calculated to be 3.4 minutes. Assuming the population standard deviation is 1.45 minutes : a) State the null hypothesis b) State the alternative hypothesis c) Which test will you use? d) Is there sufficient evidence to say that the mean wait time is longer than 3.00 minutes with a 90% level of confidence?A bottling company needs to produce bottles that will hold 12 ounces of liquid for a local brewery. Periodically, the company gets complaints that their bottles are not holding enough liquid. To test this claim, the bottling company randomly samples 15 bottles and finds the average amount of liquid held by the 15 bottles is 11.80 ounces with a standard deviation of 0.2 ounces. Which of the following is the set of hypotheses the company wishes to test?In the past, the mean running time for a certain brand of laptop has been 9.5 hours. The manufacturer has introduced a change in the battery hardware and wants to perform a hypothesis test to determine whether the mean running time has increased as a result. a) Write the hypotheses for this test. b) Explain the result of a Type 1 Error. c) Explain the result of a Type 2 Error.
- The accompanying data are drive-through service times (seconds) recorded at a fast food restaurant during dinner times. Assuming that dinner service times at the restaurant's competitor have σ=61.9 sec, use a 0.01 significance level to test the claim that service times at the restaurant have the same variation as service times at its competitor's restaurant. Use the accompanying data to identify the null hypothesis, alternative hypothesis, test statistic, andP-value. Then state a conclusion about the null hypothesis. Service Times2611141147219894270123115133310121112123136178136180130329147146165281114180204137215123106103114329185300190188180198338218266178277269170215164180170Find the test statistic for this hypothesis test.The value of the z-score in a hypothesis test is influenced by a variety of factors. Assuming that allother variables are held constant, explain how the value of z and the probability of rejecting the null hypothesis is influenced by each of the following:a. Increasing the difference between the sample mean and the original population mean. b. Increasing the population standard deviation. c. Increasing the number of scores in the sample