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Recent questions and answers in Statistics

A company is reviewing a batch of 25 products to determine if any are defective. On average, 3.5% of products are defective. What is the probability that the company will find 2 or fewer defective products in this batch?

asked Apr 27, 2023 in Statistics by Libbybaybee

help help prob and stat

asked Apr 5, 2023 in Statistics by jamesferg28

A binary variable is a variable whose value changes with a change in the number of observations.

asked Apr 1, 2023 in Statistics by bblix

Suppose you have spent GHc 1,000 for 20 pearls in one shop, another GHc 1,000 for 38 pearls in a second shop, and still another GHc 1,000 for 44 pearls in the third shop. Calculate: a) the arithmetic mean b) the harmonic mean of the three shops' prices for a pearl. c) Explain also why the arithmetic mean may be incorrect but the harmonic mean may be correct in this case.

asked Feb 24, 2023 in Statistics by Thomas112220

Help me with my assignment

asked Feb 15, 2023 in Statistics by Nana Kwame111

What is the value of Σ(X – 1)^2 for the scores 2, 2, 1, 4?

asked Jan 8, 2023 in Statistics by yuli18

An electronics manufacturer test every 50th cell phone to verify that it is functioning properly. Identify the kind of sample that is being used.

asked Dec 21, 2022 in Statistics by cmccorkle772

For a goodness-of-fit test, the degrees of freedom are equal to

asked Dec 3, 2022 in Statistics by Youngbn98

An example of data that would be analyzed with a chi-square is

asked Dec 3, 2022 in Statistics by Youngbn98

f we want to compare the contribution of several predictors to the prediction of a dependent variable, we can get at least a rough idea by comparing

asked Dec 2, 2022 in Statistics by cwagener

Complete the following probability distribution table

asked Nov 7, 2022 in Statistics by Kikivincent101

As a number of school absences decrease, number of C's and D's earned decreases as well. This is an example of

asked Sep 30, 2022 in Statistics by swesson2233

Use the empirical rule to estimate the number of farms whose land and building values per acre are between $1200 and $1600.

asked Sep 7, 2022 in Statistics by hm0211745

The annual income of workers is normally distributed with mean of Rs. 32.000 and a standard deviation of Rs. 2000. If a worker is chosen at random. what is the probability that the worker earns Between Rs. 28000 to 32.000?

asked Aug 31, 2022 in Statistics by inamullah54

A fair coin is flipped. What is the probability that the coin lands on heads?

asked May 9, 2022 in Statistics by BumBug

A programme to decrease littering was carried out in the University of Ghana starting in August 2018. The amount of litter in the streets average of collected per block per daywas measured during 2018 before the program started and then september 2019after the program had been in effect for about a yearWhat statistical test would be most appropriate for testing whether the amount of littering reduced Would the test statistic be one-tailed or two-tailed

asked May 8, 2022 in Statistics by Laudric Kayne

Which of the following statements best describes the goal of a best-fit line?

answered May 6, 2022 in Statistics by cclemente

A major cell phone service provider has determined that the number of minutes that its customers use their phone per month is normally distributed with a mean equal to 445.5 minutes with a standard deviation equal to 177.8 minutes. The company is thinking of charging a lower rate for customers who use the phone less than a specified amount.If it wishes to give the rate reduction to no more than 12 percent of its customers, what should the cut-off be

answered Apr 29, 2022 in Statistics by mochip

A recent study showed that the length of time required for customers to resolve their computer issues with online support is normally distributed with a mean equal to 0.35 hours with a standard deviation of 0.2 hours. Given this information, what is the probability of resolution will take between 10 and 15 minutes?

answered Apr 29, 2022 in Statistics by jrbryanp

On the most recent exam in your biology class, every student earned an A. The professor claims that he must be a really good teacher for all of the students to have done so well. Given the confounds discussed in this chapter, what alternative explanation can you offer for this result.

answered Mar 30, 2022 in Statistics by RedoScorer

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