based on police records, it was noted that the average number of car accidents in a busy intersection of magsaysay and francis avenue is seven per week. to check this record, a researcher conducted observations for 18 randomly selected weeks and found out that the average car accident in the same busy intersection is nine with a sample standard deviation of three. does the sample mean to contradict the police record? test the claim at 0.05 level of significance. a. state the null and alternative hypothesis b. find the critical value/s and test value c. make the decision d. conclusion

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