Which of the following statements is required for t-test and t-interval 1. Sampled population is unknown 2. Population

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answerhappygod
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Which of the following statements is required for t-test and t-interval 1. Sampled population is unknown 2. Population

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Which of the following statements is required for t-test and t-interval
1. Sampled population is unknown
2. Population standard deviation is unknown
3. Sample size should be large ( )
1. Sampled population is approximately normal
2. Population standard deviation is unknown
3. Sample size should be large ( )
1. Sampled population is unknown
2. Population standard deviation is known
3. Any sample size
1. Sampled population is normal
2. Population standard deviation is unknown
3. Any sample size.
5 points
Suppose that the 95% confidence interval for the average number of COVID-19 new cases in UAE during the last three months is given by (1014.6, 1253.4). This confidence interval uses the sample mean and the sample standard deviation based on a random sample of 16 days. It has been noticed that the number of new cases during the three months is approximately normal. What is the sample standard deviation used when computing the interval? Round your answer to the nearest integer.
5 points
A random sample of 64 college students is selected to estimate the mean commuting time to the university. Assuming that the standard deviation of the commuting times is 5.6 minutes. Find the margin of error for a 95% confidence interval for the mean commuting time to the university. Round your answer to two decimal places.
1.37
1.4
1.14
1.64
Della has over 500 songs on her mobile phone and she wants to estimate what proportion of the songs are by a female artist. She takes and SRS of 50 songs on her phone and finds that 20 of the songs sampled are by a female artist.
Based on this sample, which of the following is a 99% confidence interval for the proportion of songs on her phone that are by a female artists?
hoopiston QUESTION 20 Which of the following statement is required for test and interval O Sampled population is unknown 2. Populi standard deviation is unknown 1 Sample sue should be large in 30) O Sumpled population is approximately nemal 2. Population standard deviation is nown 3. Sumple sice should be large in 230) 1. Sampled population is unknown 2. Population standard deviation is known Any samples 01 Sumpled population is normal 2. Population standard deviation in 3. Any sample QUESTION 21 Suppose 95% confidence interval for the verge number of COVID-19 news in UAB during the last three gre by 10146,12510 The the sample means the sample standard deviation buted and sample of days. It has one that the number weitere Beel. What is the sample standard deel when coming the interval Resource is the rest inte QUESTION 22 Andample of 64 coletades to climate the coming time to the vet, that the addition that Find den for for a 955. confidence interval for the main conting time to the very Round your own well D3 OTA 1.14 OL Click to ench Alam
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