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a) A researcher claims that less than 20% Canadians worry that they will contract COVID-19. A...

a) A researcher claims that less than 20% Canadians worry that they will contract COVID-19. A random sample of 1000 Canadians revealed that 230 were worried that they will contract COVID-19. What is the value of the test statistic for testing this claim?

b)Replacement times for TV sets have a mean of 8.2 years and a standard deviation of 1.1 years. The probability that 41 randomly selected TV sets will have a mean replacement time less than 8.1 years is approximately

c)In testing H0:μ=87 versus Ha:μ≠87 for some population, a random sample of 13 observations from a normally distributed population with unknown standard deviation yielded a test statistic of 2.418. The p-value for this test is?

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