In a t-test, if the resultant t value is -2.72 and p < 0.05, what is the interpretation?

The percentage of vehicles on a freeway that violate the speed limit is π = 0.88 You randomly clock  n = 80  vehicles.   34 In the previous question, what is the standard deviation of the number of vehicles violating the speed limit?   a 2.761               b 2.907               c 3.060               d 3.221

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In a random sample of ten cell phones, the mean full retail price was $554.00 and the standard deviation was $167.00. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 95% confidence interval for the population mean u. Interpret the results. Identify the margin of error. (Round to one decimal place as needed.)

The number of hours in a month a sample of 12 people chosen at random from a normal population work is as follows: 55,55,54,56,56,58,60,62,61,59,59,60. Can we conclude that the mean of the sample differs significantly from the assumed population average of 56 hours? Given that t11,0.05  2.201.

Cody took his first physics exam and scored an 80. The population mean for this exam is 70, and the standard deviation is 5. What is the probability of selecting a person with a score greater than Cody’s?

Claim: Most adults would erase all of their personal information online if they could, A software firm survey of 586 randomly selected adults showed that 61% of them would erase all of their personal information online if they could. Find the value of the test statistic. The value of the test statistic is. (Round to two decimal places as needed.)

Thirty-two different video games showing alcohol use were observed. The duration times of alcohol use (in seconds) were recorded. When using this sample for a t test of the claim that the population mean is greater than 77 sec, what does df denote, and what is its value? What does df denote? OA. The number of degrees of freedom O B. The sample size O C. The sample standard deviation O D. The test statistic The value of df is . (Type an integer or a decimal. Do not round.) Activate Windows Go to Settings to activataWInoowe Next Statcrunch 3:58 PM o 耳 局 11/29/2021 2) Type here to search 4+ 144 %23 4 6 7. 00 R. T LO %24

Claim: Fewer than 91% of adults have a cell phone. In a reputable poll of 1045 adults, 82% said that they have a cell phone. Find the value of the test statistic. The value of the test statistic is (Round to two decimal places as needed.)

What is a point estimate in a confidnece interval for a t test?