The reason we use procedures instead of procedures when carrying out a test about a population mean is that
(a) can be used only for large samples.
(b) requires that you know the population standard deviation .
(c) requires you to regard your data as an SRS from the population.
(d) applies only if the population distribution is perfectly Normal.
(e) can be used only for confidence intervals.
The reason we use procedures instead of procedures when carrying out a test about a population mean is that (c) requires you to regard your data as an SRS from the population.
Given in the question that The reason we use procedures instead of procedures when carrying out a test about a population mean is that we have to fin out taht which option is correct.
There are two tests test and test. The reason of using the procedures instead of test is required to discuss here.
-test and -test are defined as statistical procedures that are used to determine whether the sample mean differs from the population mean or not. It must be noted that -test is preferred to use when the standard deviation of the population is given, and -test is used the standard deviation of the population is not given.
The correct option is (c).
Is your food safe? Do you feel confident or not confident that the food available at most grocery stores is safe to eat? when a gallup poll asked this question, of the sample said they were confident." Callup announced the poll's margin of error for confidence as percentage points. Which of the following sources of error are included in this margin of error? Explain.
(a) Gallup dialed landline telephone numbers at random and so missed all people without landline phones, including people whose only phone is a cell phone.
(b) Some people whose numbers were chosen never answered the phone in several calls or answered but refused to participate in the poll.
(c) There is chance variation in the random selection of telephone numbers.
The design of controls and instruments affects how easily people can use them. A student project investigated this effect by asking right-handed students to turn a knob (with their right hands) that moved an indicator. There were two identical instruments, one with a right-hand thread (the knob turns clockwise) and the other with a left-hand thread (the knob must be turned counterclockwise). Each of the students used both instruments in a random order. The following table gives the times in seconds each subject took to move the indicator a fixed distance:
(a) Explain why it was important to randomly assign the order in which each subject used the two knobs.
(b) The project designers hoped to show that right-handed people find right-hand threads easier to use. Carry out a significance test at the significance level to investigate this claim
Anemia Hemoglobin is a protein in red blood cells that carries oxygen from the lungs to body tissues. People with fewer than grams of hemoglobin per deciliter of blood are anemic. A public health official in Jordan suspects that Jordanian children are at risk of anemia. He measures a random sample of children. Check the conditions for carrying out a significance test of the official’s suspicion.
Growing tomatoes An agricultural field trial compares the yield of two varieties of tomatoes for commercial use. Researchers randomly selected Variety A and Variety B tomato plants. Then the researchers divide in half each small plots of land in different locations. For each plot, a coin toss determines which half of the plot gets a Variety A plant; a Variety B plant goes in the other half. After harvest, they compare the yield in pounds for the plants at each location. The differences give and. A graph of the differences looks roughly symmetric and single-peaked with no outliers. Is there convincing evidence that Variety A has a higher mean yield? Perform a significance test using to answer the question.
The most important condition for sound conclusions from statistical inference is that
(a) the data come from a well-designed random sample or randomized experiment
(b) the population distribution be exactly Normal.
(c) the data contain no outliers.
(d) the sample size be no more than of the population size.
(c) the sample size be at least .
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