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2 years ago

9. The results of a random survey is displayed in the histogram as shown.

Mathematics

1 answer:

natali 33 [55]2 years ago

7 0

The number of people in the sample survey is 75.

Survey sampling, as used in statistics, is the process of choosing a sample of constituents from a target population to perform a survey. The word "survey" can be used to describe a wide range of observational methods or procedures. Most frequently, a questionnaire meant to assess people's traits and/or opinions is employed in survey sampling. The topic of survey data collecting involves various methods of contacting sample participants after they have been chosen. Sampling is done to cut down on the expense and/or labor required to survey the complete target population. A census is a survey that includes all members of the target population. A sample is a subset or segment of a population from which data will be drawn.

The sample survey has

5 people in 1-4 miles per week

10 people in 5-8 miles per week

15 people in 9-12 miles per week

20 people in 13-15 miles per week

25 people in 16-19 miles per week

The number of people in the sample survey is

5 + 10 + 15 + 20 + 25

=5(1 + 2 + 3 + 4 + 5)

=5(15)

=75

Hence, the number of people in the sample survey is 75.

Learn more about sampling survey here-

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Let x be a random variable representing dividend yield of bank stocks. We may assume that x has a normal distribution with σ = 2

alisha [4.7K]

Answer:

$z=\frac{5.38-4.6}{\frac{2.1}{\sqrt{10}}}=1.175$

The p value can be founded with the following probability:

$p_v =P(z>1.175)=0.120$

Since the p value is higher than the significance level of 0.01 we have enough evidence to FAIL to reject the null hypothesis and we can't conclude that the true mean for this case is higher than 4.6%

Step-by-step explanation:

Information provided

$\bar X=5.38$ represent the sample mean