University personnel are concerned about the sleeping habits of students and the negative impact on academic performance.  In a random sample of 377 U.S. college students, 209 students reported experiencing excessive daytime sleepiness (EDS).  Is there sufficient evidence to conclude that more than half of U.S. college students experience EDS?  Use a 5% level of significance

Q: of parents of children in high school felt it was a serious problem that high school students were…

A: Three conditions:1. Random: The sample is selected randomly, the first condition is satisfied.2.…

Q: Illustrate the relationship between the sampling distribution of p and the normal distribution?

A: It is known that, the conservative law of thumb for the sampling distribution of sample proportion…

Q: The U.S. Department of Transportation, National Highway Traffic Safety Administration, reported that…

A: Given data,The population proportion (P) = 77% = 0.77,Sample size (n) = 28,Number of injured driver…

Q: When the sample size is 15 and you are doing a t test, the number of degrees of freedom is 15. True…

A: Given that  Sample size n =15 Degree of freedom =df =n-1

Q: 3. For a given level of significance, if the sample size is increased, the power of the test will…

A: Here, when we take large sample size then z value will be increase. Then we will be reject the null…

Q: If a hurricane was headed your way, would you evacuate? The headline of a press release states,…

A: Sample size = n = 4625 Sample proportion = p̂ = 0.32

Q: Illustrates the effect of  significance level on the power of a two-sample t test?

A: Power of a hypothesis test: The probability of not committing a Type II error is called the power of…

Q: a) With no prior research, what sample size should you gather in order to obtain a 0.015 margin of…

A: When we don't have any prior information about the population proportion, we generally take it as…

Q: The General Social Survey is an annual survey given to about 1500 U.S. adults selected at random. A…

A:

Q: The Chancellor wants you to calculate a second sample size after sample 1 produced a 40% response…

A: From the provided information, Confidence level = 80% Margin of error (E) = 7% that is 0.07 Sample…

Q: To determine whether a sample should be treated as a simple random sample, which is more important:…

A:

Q: which statistic is equivalent to dividing the sum of scores equally across all members of a sample

A: The statistic measures the characteristics of samples to estimate the population.

Q: As the sample size increases, what happens to the p-value associated with a given sample mean?

A: In statistics, the sample size is the no of units present in a sample that is drawn from a…

Q: a). At 5% level of significance, is there evidence to support the board’s intention? Your conclusion…

A: The provided information is n1=150 , n2=225x1=93, x2=126α=0.05 The hypothesis are Ho:p1=p2H1:p1≠p2…

Q: illustrates the effect of sample size on the power of a two-sample t test?

A: A test of hypothesis consists of 2 hypotheses: the null, H0, and the alternative, H1.   For a sample…

Q: A poll in Canada states that 67% of all respondents favor imposing the death penalty. The poll was…

A: Given that - A poll in Canada states that 67% of all respondents favor imposing the death penalty.…

Q: Find the probability that mean of sample size 36 will be negative.

A:

Q: Explain why you should get a much better prediction for μ by using x from a sample size n rather…

A: The confidence interval on mean is given as x-Zα2sdn≤μ≤x-Zα2sdn where  μ=population meanx=sample…

Q: In 1992​,researchers investigated the effect of​ weed-killing herbicides on house pets. They…

A: Given, In 1992​,researchers investigated the effect of​ weed-killing herbicides on house pets. They…

Q: In 1949, an organization surveyed 1100 adults and asked, "Are you a total abstainer from, or do you…

A: Given: n1=1100x1=374p1=0.34n2=1100x2=330p2=0.30

Q: Past records indicate that 45% of students eat breakfast while driving to school. A campaign to…

A: Solution: State the hypotheses Null hypothesis: That is, the proportion of students eats breakfast…

Q: 9. Under what circumstances will the distribution of sample means be normal?

A:

Q: What sample size should be selected to estimate the proportion of out of state guests with a margin…

A: Margin of error, ME = 0.05 sample proportion, p̂ = 0.45 confidence level, c = 95 % = 0.95…

Q: f children in high school felt it was a serious problem that high school students were not being…

A: Given: n= 800 p=0.46Now, np = 800* 0.46=368 >10 (Greater than 10) n(1-p) = 800* (1-0.46)=432 >…

Q: which is more appropriate if the sample size is more than 50? Kolmogorov test or Shapiro test?

A:

Q: What happens to the sample size when you don’t know a prior sample proportion?

A: To calculate the sample size when we do not know prior sample proportion.

Q: In the Star and Tribune newspaper, there is an article entitled “1 in 8 school buses fail tests."…

A: Given information: Sample of 200 buses and find that 20 buses fail the safety inspection. Let us…

Q: Teip An advocacy organization surveys 967 citizens of country A and 182 of them reported being born…

A: Sample proportion: Sample proportion is the proportion of individual in a sample with specific…

Q: Twenty years ago, 52% of parents of children in high school felt it was a serious problem that high…

A: The proportion is p0=0.52 The total number of samples n=700 The value of…

Q: Is the proportion of twin births among teenage mothers different from the overall figure?

A: It is given that Sample size n = 469 Number of twin births, X = 7 Level of significance = 10% = 0.10

Q: Twenty years ago, 56% of parents of children in high school felt it was a serious problem that high…

A: Using the given data fill the blanks

Q: You have been asked to estimate the proportion of households in Chicago that have two or more…

A: a) Given margin of error(ME)=4%=0.04 Confidence level=95% Significance level=5% The critical value…

Q: Twenty years ago, 54% of parents of children in high school felt it was a serious problem that high…

A: Given n=850 P0=0.54 so n*P0(1-P0) = 850*0.54*(1-0.54) =211.1

Q: What is the Importance of Equal Sample Sizes?

A: The t-test and ANOVA assume that the sample sizes are equal. There is an importance that the two…

Q: Twenty years ago, 52% of parents of children in high school felt it was a serious problem that high…

A:

Q: The General Social Survey is an annual survey given to about 1500 U.S. adults selected at random. A…

A: The question is about hypo. testing for difference between two popl. prop. Given : No. of college…

Q: Twenty years ago, 53% of parents of children in high school felt it was a serious problem that high…

A:

Q: When is it appropriate to use a pooled sample test?

A: It is to determine when there is to use pooled sample test. There are some situation in testing we…

Q: A survey of 1016 adults in a country, asking "As you may know, as part of its effort to investigate…

A: Given data number of success , x= 549.0 sample size, n = 1016 population…

Q: Twenty years ago, 57% of parents of children in high school felt it was a serious problem that high…

A: From the provided information, Population proportion (p0) = 0.57 Sample size (n) = 700 and x = 244

Q: Does having a non-significant P-value means that the means of the sample will be the same? explain

A: The hypotheses for the means is constructed as: H0: The means of the sample will be the same. H1:…

Q: A. Since the sample sizes are both less than​ 30, it must be assumed that the samples are…

A: (a) Here the sample sizes are less than 30. so, we have to conduct a two-sample T-test  Assumptions…

Q: The manager of a small supermarket chain wants to estimate the proportion of time stockclerks spend…

A: Assume that the population proportion is 0.5. It is known that the critical value for 98% confidence…

Q: We are interested in conducting a study in order to determine what percentage of voters of a state…

A:

Q: What is the sample size (n=) and what consequences will the sample size have on my analysis and…

A: Sample size: A sample size is a subset of the desired population. It is a part of the population. It…

Q: If nothing else changed besides an increase in sample size, the p-value in a two sided test would be…

A: an increase in sample size, the p-value in a two sided test would be smaller.

Q: The General Social Survey is an annual survey given to about 1500 U.S. adults selected at random. A…

A: Given: For College graduates: n1 = 267 X1 = 106 For Highschool or less: n2 = 113 X2 = 59 α = 0.05…

Q: A researcher deciding to increase the desired sample size from n = 25 to n = 100 prior to collecting…

A: Given that: A researcher wants to Increase the size of the sample from n =25 to n=100 prior of the…

Q: The General Social Survey is an annual survey given to about 1500 U.S. adults selected at random. A…

A: From the provided information,

Q: In order to assess the opinion of students at De Anza College, a reporter for the student newspaper…

A: 11. Population is the entire set of objects or subjects to be covered for the study. Here, the…