If the same diet is given to two groups of randomly selected individuals, the samples are considered to be dependent. True or false
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If the same diet is given to two groups of randomly selected individuals, the samples are considered to be dependent.
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- According to a study on the effects of smoking by pregnant women on rates of asthma in their children, for expectant mothers who smoke 20 cigarettes per day, 22.2% of their children developed asthma by the age of two in the US. A biology professor at a university would like to test if the percentage is different in another country. She randomly selects 319 women who only deliver one child and smoke 20 cigarettes per day during pregnancy in that country and finds that 82 of the children developed asthma by the age of two. In this hypothesis test, Do the hypothesis test. Use a level of significance of a = 0.05; Use the unrounded values in Excel to find the answers for #3 and #4 4. Find the p-value. 5. The biology professor should Question 10 -- the null hypothesis.A Chicago-based firm has documents that must be quickly distributed to district offices throughout the U.S. The firm must de- cide between two delivery services, UPX (United Parcel Express) and INTEX (International Express), to transport its documents. In testing the delivery times of the two services, the firm sent two reports to a random sample of its district offices with one report carried by UPX and the other report carried by INTEX. Do the data on the next slide indicate a difference in mean delivery times for the two services? Use a .05 level of significance. [Hint: Perform a hypothesis test for difference for matched/paired samples, D = X1 − X2] (a) State the hypothesis. (b) Decide the significance level. (c) Calculate the test statistic.In a research study, wherein the researcher wanted to know if people’s intelligence is perceived differently based on race, participants observed either a Caucasian, African American, or Asian American stimulus person giving a speech. All stimulus persons gave the same verbal speech. After observing this person, the participants had to rate the stimulus person’s level of intelligence on a scale of 1-10. The participants were separated by gender and their ratings were analyzed separately. How many possible interaction effects might the researcher find? Group of answer choices 3 0 1 2
- A psychologist wishes to test a behavioral modification therapy that is claimed to improve the behavior of pre-teen autistic children. She randomly selects 40 pre-teen autistic children and exposes half of the group to the behavioral modification therapy while the other half continue with their standard treatment regimen. A standardized behavioral test is administered to each child both before and after his/her respective treatment. The population in this experiment isA company wishes to evaluate the effect of package design on one of its products, a certain brand of cereal. The four package designs are to be tested in different stores throughout a large city. There are 20 stores available for the study. The amount of cereal sold is known to vary depending on the size of the stores. The 20 stores are divided into five groups of four stores each by size. The following sales figures ($1000s) were obtained after a 1-month period. Stores Design A Design B Design C Design D 1 40 33 37 38 2 45 27 32 40 3 43 31 30 41 4 44 38 40 42 5 56 45 49 42 Enter the above data into a suitable software and then conduct an analysis of variance without blocking to test whether there is evidence of a significant difference in mean sales of different package designs. Use alpha=0.01. What is the conclusion for the null hypothesis that all treatment means are equal? O Do not reject HO. There is sufficient evidence to conclude that the average sales for all stores are not…A company wishes to evaluate the effect of package design on one of its products, a certain brand of cereal. The four package designs are to be tested in different stores throughout a large city. There are 20 stores available for the study. The amount of cereal sold is known to vary depending on the size of the stores. The 20 stores are divided into five groups of four stores each by size. The following sales figures ($1000s) were obtained after a 1-month period. Stores Design A Design B Design C Design D 1 40 33 37 38 2 45 27 32 40 3 43 31 30 41 4 44 38 40 42 5 56 45 49 42 Enter the above data into a suitable software and then conduct an analysis of variance with blocking (analyze this data as a complete block design) to test further whether there is evidence of a significant difference in mean sales of different package designs. Use alpha=0.01. What are the sums of squares for Blocks? Provide your answer to the nearest 2 decimal places.
- Suppose we measure the gasoline usage in kilometers per liter of three different makes of compact automobiles. Five cars of each make are sampled. All cars are driven over the same route using the same driver, fuel, and so forth. Thus all possible influences on kilometer except for make of car are controlled as much as possible, use a 5% level of significance to test if the three makes of cars get equal kilometers on average. MAKE OF CAR OBSERVATION 1 2 3 1 30 33 35 2 37 39 26 3 32 22 41 4 29 49 35 5 22 27 37People who work out vigorously for an hour or more experience loss of electrolytes such as calcium, potassium, and sodium that are released from the body by sweat. Potassium is a very important part of many bodily functions for athletes, including transmitting nerve signals and fluid balance. A random sample of 9 athletes were given water after a vigorous one-hour workout and their electrolytes were then checked and recorded. After another vigorous one-hour workout on a different day, the same 9 athletes’ electrolytes were checked after being given a sports drink. Their potassium levels are given below. Do sports drinks help replenish lost potassium levels more than water after a vigorous workout? Refer to the table below. Water: 4.17, 2.88, 4.71, 4.79, 5.11, 4.12, 3.95, 4.22, 3.86 Sports Drink: 4.20, 3.30, 4.69, 4.82, 5.17, 4.08, 4.49, 4.54,3.71 hypothesis test needed Hypothesis test neededThe Children's Hospital of Orange County (CHOC) recommends that children drink the number of 8- ounce cups of water equal to their age. This means that a five-year-old child should drink five 8- ounce cups of water each day (40 oz of water). Suppose a sample of 50 five-year-old children was randomly selected from all residents of Irvine, CA. Families of the children were asked to record their child's water consumption for two consecutive days on a weekend and the average number of ounces of water over the two days was recorded as the estimated daily water intake for each child. The study started in June and ended in August. Suppose you find that the average water intake of all five-year-olds in the sample is 37 ounces per day with a standard deviation of 4.5 oz. 14. Based on the 95% Cl of (35.25193, 38.87857), which of the following values is plausible for a p- value? 0.2505 0.85 0.95 0.002505
- An analysis is performed on vacant land parcels in the city of Thunder Bay to find out whether or not they are randomly distributed. A sample area of 24 square kilometers was studied and divided into quadrats, with the following summary: 3 4 5 3 5 3 Calculate the following statistics: -the mean number of points per cell -the variance: s2 -the variance-to-mean ratio, VMR -the test statistic, x2*Identify the selection below that contains the correct values for these statistics in the same order they are listed. 5.333, 3.37, 2.414, 19.312 24, 9, 1.77, 11.8 3, 2.25, 0.75, 6.0 3.141, 9, 1.893, 15.144 3, 2.25, 1.3333, 10.66The Consumer Reports Restaurant Customer Satisfaction Survey is based upon 148,599 visits to full-service restaurant chains.† One of the variables in the study is meal price, the average amount paid per person for dinner and drinks, minus the tip. Suppose a reporter for a local newspaper thought that it would be of interest to her readers to conduct a similar study for restaurants located in her city. The reporter selected a sample of 8 seafood restaurants, 8 Italian restaurants, and 8 steakhouses. The following data show the meal prices ($) obtained for the 24 restaurants sampled. Italian Seafood Steakhouse $13 $16 $25 14 18 19 16 18 23 18 25 25 17 24 20 21 16 22 18 19 28 11 24 30 Use ? = 0.05 to test whether there is a significant difference among the mean meal price for the three types of restaurants. State the null and alternative hypotheses. H0: ?Italian = ?Seafood = ?SteakhouseHa: ?Italian ≠ ?Seafood ≠ ?Steakhouse H0: ?Italian ≠ ?Seafood ≠ ?SteakhouseHa:…In a survey of working parents (both parents working), one of the questions asked was "Have you refused a job, promotion, or transfer because it would mean less time with your family?" 480 men and 480 women were asked this question. 21% of the men and 27% of the women responded "Yes". Based on this survey, can it be concluded that there is a difference in the proportion of men ( p1 ) and women ( p2 ) responding "Yes"? Use a significance level of α=0.1 for the test. Step 2 of 5 : Compute the weighted estimate of p, p‾. Round your answer to three decimal places.
